Drove of Elves 

Creature — Elf
Hexproof
Drove of Elves's power and toughness are each equal to the number of green permanents you control.
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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.
Regal Bunnicorn 88%
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Faerie Swarm 87%
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Chameleon Spirit 82%
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"this card's power and toughness are each equal to the number of permanents of the chosen color your opponents control."