Shalai and Hallar 
Legendary Creature — Angel Elf
$6.63 #4050 0.36 3.4 years
Flying, vigilance
Whenever one or more +1/+1 counters are put on a creature you control, Shalai and Hallar deals that much damage to target opponent.
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Cards similar to Shalai and Hallar 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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"Flying"
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"At the beginning of your end step, you may have this creature deal damage equal to the number of +1/+1 counters on it to target player or planeswalker."
Hovermyr70%
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"Flying, vigilance"
Enduring Scalelord70%
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"Whenever one or more +1/+1 counters are put on another creature you control, you may put a +1/+1 counter on this creature."