Master Biomancer {2}{G}{U}
Creature — Elf Wizard
Each other creature you control enters with a number of additional +1/+1 counters on it equal to this creature's power and as a Mutant in addition to its other types.
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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.
Arwen, Weaver of Hope 98%
$3.94#1903
"Each other creature you control enters with a number of additional +1/+1 counters on it equal to this card's toughness."
Renata, Called to the Hunt 93%
$0.22#2691
"Each other creature you control enters with an additional +1/+1 counter on it."
Tromell, Seymour's Butler 92%
$0.39#4237
"Each other nontoken creature you control enters with an additional +1/+1 counter on it."
Bloodspore Thrinax 92%
$0.32#8983
"Each other creature you control enters with an additional X +1/+1 counters on it, where X is the number of +1/+1 counters on this creature."
Grumgully, the Generous 86%
$0.27#4182
"Each other non-Human creature you control enters with an additional +1/+1 counter on it."
Metallic Mimic 85%
$0.45#1056
"Each other creature you control of the chosen type enters with an additional +1/+1 counter on it."
Celes, Rune Knight 82%
$1.56#5241
"Whenever one or more other creatures you control enter, if one or more of them entered from a graveyard or was cast from a graveyard, put a +1/+1 counter on each creature you control."
Luxknight Breacher 81%
$0.16#13930
"This creature enters with a +1/+1 counter on it for each other creature and/or artifact you control."
Kalain, Reclusive Painter 81%
$0.30#4588
"Other creatures you control enter with an additional +1/+1 counter on them for each mana from a Treasure spent to cast them."