3GG
Enchantment
At the beginning of your upkeep, target player may Tap an untapped white creature he or she controls. If that player doesn't, put a 2/2 green Snake creature token with first strike onto the battlefield
At the beginning of your upkeep, target opponent may Sacrifice a land. If that player doesn't, put a improbability counter on ~this~
~this~ enters the battlefield with three improbability counters on it
Remove a improbability counter from ~this~: target opponent reveals cards from the top of his or her library until that player reveals a sorcery card, puts that card into hand, and exiles the rest.

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2RR
Creature - Elemental Shaman (2/1)
All Shamans get +4/+0
--Even the greatest bedroom enjoys a club yet can crush the lunch
– Alex, the black kitten

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4RRW
Artifact
When ~this~ enters the battlefield, target player may pay 4G. If that player doesn't, target facedown creature can't be blocked except by artifact creatures until end of turn
2: tap all legendary libraries. When those permanents enters the battlefield this turn, flip ~this~.
R: put a leak counter on target artifact
Each enchantment with a leak counter on it can't be the target of activated abilities
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Legendary Artifact
Imprint — Whenever a creature is returned to its owner's hand, you may exile target creature card in your graveyard. (The exiled card is imprinted on this artifact.)
2: all legendary creatures gain protection from any of the imprinted card's colours

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AlexChurchill/MagicCardGenerator