Hand of Emrakul 
Creature — Eldrazi
$0.41 #12812 0.73 16.4 years
You may sacrifice four Eldrazi Spawn rather than pay this spell's mana cost.
Annihilator 1 (Whenever this creature attacks, defending player sacrifices a permanent of their choice.)
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Cards similar to Hand of Emrakul 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.
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"If it's your turn, you may sacrifice a Mountain rather than pay this spell's mana cost."