Enhancement Explosion
Instant
Destroy all permanents with counters on them.

Bant's Savior
Creature - Human Soldier
First Strike
Creatures can't be destroyed by instants and sorceries.
5/4

Phantasmal Opponent 3U
Enchantment - rare
Phantasmal opponent may block as though it were a creature. When it does it becomes a 2/2 blue illusion creature with all non-activated abilities of the creature it's blocking, +X/+X, where X is the creature it's blocking's toughness and "when this creature becomes the target of a spell or ability, sacrifice it". At the end of combat it becomes an enchantment again.

Quick Question: If you were to cast a spell on Phantasmal Opponent while it was a creature, would you have to sacrifice it? Does the fact that sorceries and instants can't destroy creatures, include sacrificing?

Pureheart Crusader

Creature - Knight
Protection from enchantments
2/2

Oblivion Bliss
Enchantment
: Creatures lose all protection abilities, shroud and/or hexproof until end of turn.
, , sacrifice ~: Destroy target creature.

Sanctity of Life
Enchantment
Players cannot sacrifice permanents.

Shardfenix,
your card doesn't really "hose" my Phantasmal opponent because when it blocks it is no longer an enchanment but instead a creature. Therefore the "protection from enchantments" ability wouldn't have any effect.

Surprise Defender
Creature - Elemental
Flash
You can cast ~ only if you are attacked.
At end of turn, sacrifice ~.
7/7

Suprise Defender - Isn't a 7/7 for 2 mana a bit OP? Swing with a Primeval Titan, oh look! It's dead. Power level is pretty far off, but a good idea. 6/10

Cross-Planar Warfare
World Enchantment
All creatures have Defender.
All creatures have ": Deal damage to target creature or player equal to this creature's power."

Stone Idol Trap, a card that costs at max 6, but normally 2-4 mana, it survives anything except for deathtouchers, and some really HUGE creatures and you get a 6/12 trample to attack with next turn. Surprise defender, you get only one block that kills most of creatures and then it dies (well, except if Sanctity of Life is OtB, but this doesn't really count ) Compare. ^^

Power of Nature
Enchantment - Aura
Enchant permanent
Flash
Enchanted permanent has hexproof.
If damage would be dealt to enchanted permanent, prevent it and put a +1/+1 counter on it if it is a creature, a charge counters on it if it is an artifact and/or a loyalty counter on it if it is a planeswalker for each 1 damage prevented this way.

Doesn't quite work if they want to target you, though. Would work better if it made YOU hexproof. 7/10

Purity of Spirit
Enchantment
Auras have no effects.

Purity of Spirit isn't very original, but it works 7/10
Question: what would happen if you had a non aura enchantment that said "target enchantment becomes an aura" It would make some sort of weird Paradox?
Anyway:

Purification 1W
Instant - Uncommon
Destroy target enchantment.

Say hello to demystify

That would be weird. Nice card copy, increased cost notwithstanding.

Oona's Symbol Guard (Ugh, what a terrible name)
Creature - Faerie Wizard [u]
Flying
Sacrifice ~: target enchantment becomes indestructible until end of turn.
Magic can fluctuate wildly in the courts of the fey. Some must be ready to stabilize it.
1/1

Yuck, that flavor text sucked, too.

Ugh
That's the second time I've stolen something from an already existing card without realising it.

"Shardfenix,
your card doesn't really "hose" my Phantasmal opponent because when it blocks it is no longer an enchanment but instead a creature. Therefore the "protection from enchantments" ability wouldn't have any effect."

Wrong. Your enchantment isn't allowed to spontaneously become a creature for no reason, go back in time, then block as a creature. The way you have it worded, it blocks first (which it cannot do vs my card), then becomes a creature. A creature with protection from enchantments can't be blocked by enchantments. It's in the rules.

Oona's Symbol Guard (maybe Sigilguard of Oona? There's a thought...): Not a bad card at all. My only gripe with it is breaking in that this card isn't blue. blue never has cards specific to enchantments unless part of a cycle, block, or is stealing them. Blue has never protected enchantments and enchantments only and indestructible is incredibly rare too on blue, and i don't feel the color bleed is worth it for a rather basic card. 6/10

Demon's Stasis
Enchantment
Whenever an activated ability would activate, counter it unless it's controller discards a card.

Firstly, sorry shardfenix you're completely right. I wasn't quite sure on the specifics.
EyeofTruth: Your card is cool in general, it might be just a little OP but it seems reasonable enough. 9/10

Merfolk Pathmaker
Creature
Spells or abilities you cast/activate, can't be countered.
1/1

That's a tough one Silver

Air of Forgetfulness
Enchantment
: Exile target spell or ability an opponent controls that's being targeted by a spell you control.

Air of Forgetfulness: A simple, yet interesting work-around. In Shadowfist circles they would call this 'janky' - not particularly useful in most situations, and wouldn't be in most decks, but a good player can make it work for them. (I'm not sure if Magic players have a slang for that.)

Is it OK to do a split card? Whoever comes next can hose either side.

Perfect Order //
Enchantment - Aura
Enchant enchantment
Triggered abilities on the enchanted card may not be used.

// Total Chaos
Enchantment - Aura
Enchant enchantment
Static abilities on the enchanted card may not be used.

Nice. That's a good thing to have a choice between.

Auravoid Apprentice
Creature - Human Spellshaper
If ~ would become enchanted by an aura, counter that aura and flip ~.
1/1

Rikin, Voider of (warranties, i mean)Impurities.
Legendary Creature - Human Spellshaper
Protection from Enchantments
,: Destroy target enchantment.
1/4

Venom Slinger
Creature - Snake
Deathtouch
Whenever ~ attacks, you may have it deal 1 damage to target creature.
1/1

srry double post

Dominating Mind
Instant
Until end of turn, you can change the targets of any spell or ability once per spell or ability.

Has nobody checked this thread or are we all waiting for someone else to hose that card?

We're Playing PAUPER Magic!
Instant
Counter target rare spell.
"Mythic Rare doesn't count."
"But it's mythic RARE!"

Teferi's Shield
Enchantment
Other players can't cast spells during your turn.

Demistification
Sorcery
Solid Idea (You may cast this face down as a 2/2 creature for . You may flip it and put it on the stack at any time for it's solid idea cost.)
Destroy target enchanment.

Deceit's Bane
Creature - Human Cleric
When ~ comes into play, destroy all face-down cards.
Spells cannot be cast face-down.
1/1

Polymorphic Shapeshifter
Creature - Illusion
Changeling
When ~ ETB, put two target creatures face-down.
3/3

Violent Mutations
Enchantment
When ~ enters the battlefield, choose a creature type.
At the beginning of your upkeep, each player puts a copy of target creature of the chosen type onto the battlefield.
Each creature of the chosen type gets -1/-1 for each creature creature of the chosen type on the battlefield.

Tanglegrove Champion
Creature - Elf Warrior
Hexproof
Other elves you control get +2/+2.
2/2

Genocide
Sorcery
Choose a creature type. Destroy all creatures of the chosen type.

Identity Crisis
Enchantment
All creatures lose all creature types.

Nameless Kin
Creature
Protection from white
Those who have no surface can't be illuminated.
1/1

Honors to http://magiccards.info/dk/en/12.html .

Someone else had a very similar idea to this, but I can't remember who it was to give them credit.

Outcast's End
Instant
Destroy target creature if it doesn't share a creature type with any other creatures.

Splitter Roach
Creature - Insect
At the beginning of your upkeep, put a copy of Splitter Roach onto the battlefield
1/1

Skipping Scenes
Instant
Target player skips his or her next upkeep.

k1l1: That's probably overcosted. See Eon Hub. 6/10

Thrum of Eternity -
Enchantment
If a player would skip a step, phase, or turn, he or she may take an extra one of those instead.

Time Bank
Artifact
Shroud
~ comes into play tapped and doesn't untap during its controller's untap step.
You may skip your turn in order to untap ~.
: Take an extra turn after this one.

5 mana Time Vault? Can I hose it with the BnR list?

Juked!

Instant
Until your next turn, the next time target opponent would take an extra turn, you take an extra turn instead.

Regulating Timepiece
Artifact
whenever an opponent would take an extra turn, end the turn.

Expolosive Orb
Artifact
When ~ enters the battlefield, you may put a charge counter on it.
: Put a charge counter on ~.
, sacrifice ~: Destroy each nonland permanent with converted mana cost equal to the number of charge counters on ~.

Energy absorber
Instant
Split Second
Remove charge counters from all permanents, put a 1/1 blue elemental for each charge counter removed this way.

Pity the Faceless Hoards
Sorcery
Destroy all token creatures. They can't be regenerated.
"Don't you understand? Saying, 'You go, I'll hold them off' is a death sentence, even for main characters! And you guys don't even have names!" - Elan

Hungry Redirection
Enchantment
Whenever a token you control would be destroyed you may destroy another target creature you control instead. If you do, put +1/+1 counters on the token that would be destroyed equal to the creatures power that you destroyed instead.

Sorry the wording is so confusing, hope you can understand it.

Bloodbound Plague
Sorcery
Each creature gets -1/-1 for each other creature on the battlefield that shares at least one creature type with it until end of turn

Weakness into Strength
Instant
Whenever a -1/-1 counter would be placed on a creature you control this turn put a +1/+1 counter on it instead

Edit : symbols were off!

Syphon Strength
Sorcery
Remove all +1/+1 counters from permanents, then put that many +1/+1 counters on target creature.

Weakness into strength wouldn't work, because Bloodbound Plague doesn't give counters.

Stunted Growth
Enchantment
Only one counter can be placed on each permanent each turn.