Vernal Sovereign 
Creature — Elemental Elk
$0.21 #8409 0.29 2.5 years
Whenever this creature enters or attacks, create a green and white Elemental creature token with "This token's power and toughness are each equal to the number of creatures you control."
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Cards similar to Vernal Sovereign 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 this card attacks, create a 1/1 white Ally creature token that's tapped and attacking."
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"When this card enters, create X 2/2 red Mutant creature tokens, where X is the number of nontoken creatures you control."
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"Whenever this creature enters or attacks, create two 1/1 black Rat creature tokens with "This token can't block." Then if you control five or more Rats, each Rat you control gets +2/+0 until end of turn."
The Unbeatable Squirrel Girl72%
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"Whenever this card enters or attacks, create a 1/1 green Squirrel creature token."
Tovolar's Huntmaster // Tovolar's Packleader72%
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"Whenever this creature enters or attacks, create two 2/2 green Wolf creature tokens."
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"this card's power and toughness are each equal to the number of creatures you control."
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"Whenever this creature enters or attacks, you get 
for each creature you control."
for each creature you control."