Loki Laufeyson {1}{R}
Legendary Creature — God Sorcerer Villain
{1}, {T}: When you next cast an instant or sorcery spell with mana value less than or equal to Loki's power this turn, copy that spell. You may choose new targets for the copy.
Power-up — {4}{R}: Put two +1/+1 counters on Loki. (Activate each power-up ability only once. Reduce the cost by his mana cost if he 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.
Human Torch, Johnny Storm 88%
$0.17#16477
"Power-up — {6}{R}: Put three +1/+1 counters on this card."
Molly Hayes, Runaway 86%
$0.34#27192
"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."