Wildfire Eternal 

Creature — Zombie Jackal Cleric
$0.26 #16616 0.50 9.1 years
Afflict 4 (Whenever this creature becomes blocked, defending player loses 4 life.)
Whenever this creature attacks and isn't blocked, you may cast an instant or sorcery spell from your hand without paying its mana cost.
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Cards similar to Wildfire Eternal 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.
Surtland Elementalist78%
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"Whenever this creature attacks, you may cast an instant or sorcery spell from your hand without paying its mana cost."
Zaffai and the Tempests78%
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"Once during each of your turns, you may cast an instant or sorcery spell from your hand without paying its mana cost."
Omnispell Adept77%
$0.23↓#190120.417.9 years↓
"
,
: You may cast an instant or sorcery spell from your hand without paying its mana cost."
Vedalken Ghoul74%
$0.22↓#27304↓0.5317.3 years↑
"Whenever this creature becomes blocked, defending player loses 4 life."
Jeleva, Nephalia's Scourge71%
$2.41↑#141850.5912.8 years↑
"Whenever this card attacks, you may cast an instant or sorcery spell from among cards exiled with this card without paying its mana cost."
The Dawning Archaic70%
$1.19↑#8544↑0.00↓0.4 years↓
"Whenever this card attacks, you may cast target instant or sorcery card from your graveyard without paying its mana cost. If that spell would be put into your graveyard, exile it instead."
Murk Dwellers70%
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"Whenever this creature attacks and isn't blocked, it gets +2/+0 until end of combat."
Efreet Flamepainter70%
$0.33↑#154090.13↓5.4 years↓
"Whenever this creature deals combat damage to a player, you may cast target instant or sorcery card from your graveyard without paying its mana cost. If that spell would be put into your graveyard, exile it instead."