Prismabasher 
Creature — Elemental
$0.19 #18521 0.00 0.6 years
Trample
Vivid — When this creature enters, up to X target creatures you control get +X/+X until end of turn, where X is the number of colors among permanents you control.
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Cards similar to Prismabasher 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.
Glister Bairn88%
$0.10↓#22625↓0.000.6 years
"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."
Luminollusk80%
$0.11↓#22553↓0.000.6 years
"When this creature enters, you gain life equal to the number of colors among permanents you control."
Explosive Prodigy76%
$0.12↓#213560.000.6 years
"When this creature enters, it deals X damage to target creature an opponent controls, where X is the number of colors among permanents you control."
Shinestriker76%
$0.32↑#10835↑0.000.6 years
"When this creature enters, draw cards equal to the number of colors among permanents you control."
Faeburrow Elder74%
$0.41↑#502↑0.31↑6.9 years↑
"This creature gets +1/+1 for each color among permanents you control."
Kithkeeper70%
$0.10↓#23597↓0.000.6 years
"When this creature enters, create X 1/1 green and white Kithkin creature tokens, where X is the number of colors among permanents you control."