Skemfar Shadowsage 

Creature — Elf Cleric
$0.28 #4536 0.16 5.6 years
When this creature enters, choose one —
• Each opponent loses X life, where X is the greatest number of creatures you control that have a creature type in common.
• You gain X life, where X is the greatest number of creatures you control that have a creature type in common.
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Cards similar to Skemfar Shadowsage 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.
Flash Thompson, Spider-Fan79%
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"When this card enters, choose one or both —"
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"When this creature enters, choose up to one —"