Toothy, Imaginary Friend 
Legendary Creature — Illusion
$11.43 #5239 0.18 8.4 years
Partner with Pir, Imaginative Rascal (When this creature enters, target player may put Pir into their hand from their library, then shuffle.)
Whenever you draw a card, put a +1/+1 counter on Toothy.
When Toothy leaves the battlefield, draw a card for each +1/+1 counter on it.
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Cards similar to Toothy, Imaginary Friend 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 you draw a card, put a +1/+1 counter on this card."
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"Whenever you draw a card, put a +1/+1 counter on this creature."
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"When this creature leaves the battlefield, draw a card."
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"When this creature leaves the battlefield, you may pay 
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"Whenever you draw a card, you may pay 
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"When this creature leaves the battlefield, draw a card."
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"Whenever you draw a card, put a +1/+1 counter on this card."
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"Whenever you draw a card, put a +1/+1 counter on enchanted creature."