Ash Zealot 

Creature — Human Warrior
$0.25 #15635 0.14 14.0 years
First strike, haste
Whenever a player casts a spell from a graveyard, this creature deals 3 damage to that player.
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Cards similar to Ash Zealot 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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"Whenever a player casts a spell with mana value 3 or less, this enchantment deals 2 damage to that player."
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"Whenever an opponent casts a spell with mana value 3 or less, this creature deals 1 damage to that player."