Ydwen Efreet {R}{R}{R}
Creature — Efreet
Whenever this creature blocks, flip a coin. If you lose the flip, remove this creature from combat and it can't block this turn. Creatures it was blocking that had become blocked by only this creature this combat become unblocked.
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Cards that do something similar expected a card that isn't here?
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Tide of War 88%
$1.56#13952
"Whenever one or more creatures block, flip a coin. If you win the flip, each blocking creature is sacrificed by its controller. If you lose the flip, each blocked creature is sacrificed by its controller."
Harried Spearguard 82%
$0.16#14278
"When this creature dies, create a 1/1 black Rat creature token with "This token can't block.""
Spitting Slug 82%
$0.31#31277
"Whenever this creature blocks or becomes blocked, you may pay {1}{G}. If you do, this creature gains first strike until end of turn. Otherwise, each creature blocking or blocked by this creature gains first strike until end of turn."
Aetherplasm 82%
$0.13#20532
"Whenever this creature blocks a creature, you may return this creature to its owner's hand. If you do, you may put a creature card from your hand onto the battlefield blocking that creature."
Crawling Chorus 82%
$0.27#6266
"When this creature dies, create a 1/1 colorless Phyrexian Mite artifact creature token with toxic 1 and "This token can't block.""
Stinging Hivemaster 82%
$0.19#15499
"When this creature dies, create a 1/1 colorless Phyrexian Mite artifact creature token with toxic 1 and "This token can't block.""
Totentanz, Swarm Piper 82%
$0.26#8306
"Whenever this card or another nontoken creature you control dies, create a 1/1 black Rat creature token with "This token can't block.""
Anax, Hardened in the Forge 82%
$0.16#6817
"Whenever this card or another nontoken creature you control dies, create a 1/1 red Satyr creature token with "This token can't block." If the creature had power 4 or greater, create two of those tokens instead."
Tangled Colony 82%
$0.74#5341
"When this creature dies, create X 1/1 black Rat creature tokens with "This token can't block," where X is the amount of damage dealt to it this turn."
Wall of Caltrops 81%
$0.93#26175
"Whenever this creature blocks a creature, if at least one other Wall creature is blocking that creature and no non-Wall creatures are blocking that creature, this creature gains banding until end of turn."