Volcanic Villain {2}{R}
Creature — Elemental Villain
Haste
Power-up — {5}{R}: Put two +1/+1 counters on this creature. (Activate each power-up ability only once. Reduce the cost by its mana cost if it entered this turn.)
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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.
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"Power-up — {5}{R}: Put two +1/+1 counters on this card. Exile the top card of your library. Until the end of your next turn, you may play that card."