Snake Breeding -- It's more interesting if the 1/1 has deathtouch, and the 5/5 doesn't (why does it need it, anyway?) With the existing version, there's no reason not to target yourself with the 5/5 deathtouch, while your opponent gets a one-turn reprieve -- barring Unsummon or other tricks.
But it's even more interesting if it affects all your teammates, and all your opponent's teammates; and if it gives everyone the choice.
.
Hide the Scrolls -- 3U
Sorcery
Remove target library from the game. At the end of turn, that library's owner chooses a card removed from the game this way, shuffles each other card removed from the game this way into his or her library, then puts the chosen card on top.
Hm. That's not expensive at all. Needs to create tokens.
.
Umezawa's Jet -- [mc]2[/mc]
Legendary Artifact - Equipment
Whenever equipped creature deals damage, put that many charge counters on Umezawa's Jet.
:symtap:: Choose one -- Add :symb::symb::symb: to your mana pool; or you may play cards in your graveyard this turn; or you win the game.
Nachtmoor Warmage -- It's difficult to judge a mechanic without all of the details on how it works. +2/-2 is a pretty strong ability, though, and shouldn't be too easy to come by. LC doesn't see how the ability or inability to play it would affect attacking or blockg decisions, especially since it's on the table for everyone to see.
You shouldn't have an apostrophe in "gets."
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Odic Earthturner -- 2RG
Creature - Orc Shaman
Whenever you play a spell or Odic Earthturner attacks, remove all lands you control from the game. At the end of turn, return all lands to play. Odic Earthturner gets +1/+0 for each land removed from the game this way.
3/3
At the end of turn
Deadwood Removal -- 3BG
Sorcery
Reveal the top five cards of target player's library. Remove all land cards revealed this way from the game.
Draw a card.
Zan and Jayna -- LC isn't certain they were human, but one of them was definitely a shapeshifter. A little broken with Wings of Velis Vel and the like.
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Pride of Forefathers -- RUW
Instant
Chose three; you may choose the same mode twice -- Creatures you control get +2/+0 until the end of turn; or Creatures you control get +0/+2 until the end of turn; or Untap all creatures you control, then untap all creatures you control at the end of turn.
Fafnir -- Well, ki counters would be right out of place in Scandinavia. That being said, it's not a terrible difficult condition to meet (for either black or red alone, yet alone both together); one creature or burn spell could get him to flip the turn he enters play. And a 4/4 double striking dragon for 1BBR is slightly broken. Since "vanilla" + "french vanilla" = "kinda boring, even on a flip card," Le Chat suggests thinking of something more unique for the dragon side.
.
But, in a like frame of mind,
Orlod's Kaleidobolt -- 3R
Sorcery
When you play Orlod's Kaleidobolt, if you spent more than two colors of mana to play it, flip it.
Orlod's Kaleidobolt deals three damage to target creature.
< - - - - - >
Orlod's Kaleidobolt
Sorcery
Orlod's Kaleidobolt deals three damage to each creature that shares a color with the mana spent to play Orlod's Kaleidobolt.
Storm Geyser -- Seems fair, since having high-cmc cards is ultimately self-limiting, and your down four mana for having played the Geyser. Might even be able to make this one cheaper (or have a secondary effect) and get away with it.
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Goroggan Dam -- 3
Artifact
Whenever a land is tapped for mana, put a dam counter on it.
Lands with dam counters lose all abilities and have ":symtap:: Remove a dam counter from this land." Skerrigan threw a stone across the water. Soon the stone would grow large, and stop the entire river.
Vision of Strength -- An instant with power and toughness? Who ever heard of such a thing.
Oh; it's an enchantment. Er -- a Planeswalker. Uh -- what type is it?
Your reminder text is wrong; by the time its costs are being determined, it's on the stack, not in your hand. Otherwise, uh, it's nice.
.
Bokorran Retch -- BB
Sorcery
Target player discards a card. Then he or she chooses a card in his or her graveyard with the same card type as that card and removes it from the game. The ghouls of the barrows spill the stomachs upon the graves of the recently-fallen. The witches of Bokorra read these for signs of the future.
Rattling Bones -- 1BB
Sorcery
Remove all cards in the graveyard from the game. For every two creature cards removed this way, create a 1/1 black Creature - Skeleton token.
Cowardice -- This creature can't block creatures with higher power. This creature's abilities can't target creatures with higher power or players with a higher life total.
Chalcedon Guardian -- 3WW
Artifact Creature - Soldier
Defender, first strike
Whenever Chalcedon Guardian blocks, put a 4/4 white Artifact Creature - Soldier named Chalcedon Guardian with first strike and "This creature can't block" into play.
4/4
But it's even more interesting if it affects all your teammates, and all your opponent's teammates; and if it gives everyone the choice.
.
Hide the Scrolls -- 3U
Sorcery
Remove target library from the game. At the end of turn, that library's owner chooses a card removed from the game this way, shuffles each other card removed from the game this way into his or her library, then puts the chosen card on top.
.
Umezawa's Jet -- [mc]2[/mc]
Legendary Artifact - Equipment
Whenever equipped creature deals damage, put that many charge counters on Umezawa's Jet.
:symtap:: Choose one -- Add :symb::symb::symb: to your mana pool; or you may play cards in your graveyard this turn; or you win the game.
You shouldn't have an apostrophe in "gets."
.
Odic Earthturner -- 2RG
Creature - Orc Shaman
Whenever you play a spell or Odic Earthturner attacks, remove all lands you control from the game. At the end of turn, return all lands to play. Odic Earthturner gets +1/+0 for each land removed from the game this way.
3/3
At the end of turn
Sorcery
Reveal the top five cards of target player's library. Remove all land cards revealed this way from the game.
Draw a card.
.
Pride of Forefathers -- RUW
Instant
Chose three; you may choose the same mode twice -- Creatures you control get +2/+0 until the end of turn; or Creatures you control get +0/+2 until the end of turn; or Untap all creatures you control, then untap all creatures you control at the end of turn.
.
Next: The clock on the windowsill runs by ants.
.
But, in a like frame of mind,
Orlod's Kaleidobolt -- 3R
Sorcery
When you play Orlod's Kaleidobolt, if you spent more than two colors of mana to play it, flip it.
Orlod's Kaleidobolt deals three damage to target creature.
< - - - - - >
Orlod's Kaleidobolt
Sorcery
Orlod's Kaleidobolt deals three damage to each creature that shares a color with the mana spent to play Orlod's Kaleidobolt.
.
Goroggan Dam -- 3
Artifact
Whenever a land is tapped for mana, put a dam counter on it.
Lands with dam counters lose all abilities and have ":symtap:: Remove a dam counter from this land."
Skerrigan threw a stone across the water. Soon the stone would grow large, and stop the entire river.
Sorcery
Discard your hand, then draw seven cards unless another player discards his or her hand.
.
Next: The temperature was seventy this morning. Now it's seven hundred.
Oh; it's an enchantment. Er -- a Planeswalker. Uh -- what type is it?
Your reminder text is wrong; by the time its costs are being determined, it's on the stack, not in your hand. Otherwise, uh, it's nice.
.
Bokorran Retch -- BB
Sorcery
Target player discards a card. Then he or she chooses a card in his or her graveyard with the same card type as that card and removes it from the game.
The ghouls of the barrows spill the stomachs upon the graves of the recently-fallen. The witches of Bokorra read these for signs of the future.
Instant
Regenerate all blue creatures you control. They don't untap during your next untap.[indent]
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Draw to Earth -- 1B
Instant
Destroy target artfact creature, enchantment creature, or land creature.
Next: Red card that manipulates your own library -- not by shuffling.
Instant
Firesmote deals one damage to any one target, plus one damage for each other source that has dealt damage this turn.
Sorcery
Remove all cards in the graveyard from the game. For every two creature cards removed this way, create a 1/1 black Creature - Skeleton token.
.
Next: - Dishonor
Artifact Creature - Soldier
Defender, first strike
Whenever Chalcedon Guardian blocks, put a 4/4 white Artifact Creature - Soldier named Chalcedon Guardian with first strike and "This creature can't block" into play.
4/4