Tide of War {4}{R}{R}
Enchantment
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.
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Cards that do something similar expected a card that isn't here?
Reports become test cases the matcher is graded against before an update ships. Delvefall isn't a chatbot guessing, it compares the printed rules text of every card with plain math, and examples like yours decide which differences should count.
Ydwen Efreet 88%
#27858
"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."
Totentanz, Swarm Piper 80%
$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.""