mox diamond 0
artifact t: add one mana of any colour to your mana pool. Use this ability only during an opponent's turn.
Until end of turn, you may pay 1 life to tap target creature
storm crow 1U
creature - bird god
As long as your devotion to storm crow is less than seven, storm crow isn't a creature (Each storm crow you control counts toward your devotion to storm crow.)
Indestructible, flying, deathtouch
Enchant Creature – Aura
When enchanted creature attacks or blocks, deal 2 damage to enchanted creature’s controller.
When ~ goes to the graveyard from the battlefield, deal 2 damage to each creature.
Target creature you control gains +6/+1, trample and haste until end of turn. At the beginning of your next end step, sacrifice that creature.
Overload 6RRRR(You may cast this spell for its overload cost. If you do, change its text by replacing all instances of "target" with "each.")
: Add to your mana pool.
Whenever an opponent casts a spell, counter that spell unless its controller pays 1 life. If they do, you gain 1 life.
Tribal Enchantment - Illusion
You may have ~ enter the battlefield as a copy of any noncreature permanent on the battlefield, except it has "When this permanent becomes the target of a spell or ability, sacrifice it."
Delver of Secrets3U
Creature - Human Wizard 2U: The next time you would draw a card this turn, look at the top three cards of your library instead. Put one of them into your hand and the rest on the bottom of your library in any order.
Order of YawgmothBBB
Creature - Zombie Knight
Menace (This creature can't be blocked except by two or more creatures.)
You may play Order of Yawgmoth from your graveyard, but not from anywhere else.
Whenever Order of Yawgmoth deals damage to a player, you may search your library for a card and put it into your graveyard, then shuffle your library.
Creature - Human Barbarian
When ~ enters the battlefield, ~ deals 3 damage to target creature.
EDIT: I was so close to the original, let's do something more creative...
Creature - Illusion
As long as an opponent controls a creature with power greater than 2, ~'s power is equal to the greatest power among creatures your opponents control.
As long as an opponent controls a creature with toughness greater than 2, ~'s toughness is equal to the greatest toughness among creatures your opponents control.
At the beginning of your upkeep, sacrifice a creature, then search your library for a creature card with converted mana cost equal to 1 plus the sacrificed creature's converted mana cost, put that card onto the battlefield, then shuffle your library.
Watcher of the Roost1WW
Creature - Bird
Other birds you control gain vigilance
At the end of your combat step, you gain 2 life for each bird you control that didn't attack this turn. All birds need time to land and rest.