Glister Bairn {2}{G/U}{G/U}{G/U}
Creature — Ouphe
Vivid — At the beginning of combat on your turn, another target creature you control gets +X/+X until end of turn, where X is the number of colors among 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.
War Machine, Legacy of Iron 91%
$0.20#24125
"At the beginning of combat on your turn, another target creature you control gets +X/+0 until end of turn, where X is this card's power."
Riling Dawnbreaker // Signaling Roar 90%
$0.14#14415
"At the beginning of combat on your turn, another target creature you control gets +1/+0 until end of turn."
Haradrim Spearmaster 90%
$0.07#21999
"At the beginning of combat on your turn, another target creature you control gets +1/+0 until end of turn."