Master Biomancer 
Creature — Elf Wizard
$0.84 #3231 0.28 13.7 years
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 similar to Master Biomancer 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.
Shelinda, Yevon Acolyte87%
$0.22↓#5407↓0.12↓1.4 years↓
"Whenever another creature you control enters, put a +1/+1 counter on that creature if its power is less than this card's power. Otherwise, put a +1/+1 counter on this card."
Arni, Renowned Champion76%
$0.15↓#26706↓0.10↓0.0 years↓
"Whenever another creature you control enters, this card gets +X/+0 until end of turn, where X is that creature's power."
Olivia, Mobilized for War76%
$0.63↓#10988↓0.05↓10.5 years↓
"Whenever another creature you control enters, you may discard a card. If you do, put a +1/+1 counter on that creature, it gains haste until end of turn, and it becomes a Vampire in addition to its other types."
Jenova, Ancient Calamity75%
$1.13↑#4125↓0.13↓1.4 years↓
"At the beginning of combat on your turn, put a number of +1/+1 counters equal to this card's power on up to one other target creature. That creature becomes a Mutant in addition to its other types."
Good-Fortune Unicorn75%
$0.28↓#35460.15↓7.4 years↓
"Whenever another creature you control enters, put a +1/+1 counter on that creature."
Hamletback Goliath74%
$0.20↓#9218↓0.06↓19.0 years↑
"Whenever another creature enters, you may put X +1/+1 counters on this creature, where X is that creature's power."
Juniper Order Ranger74%
$0.15↓#8248↓0.18↓21.2 years↑
"Whenever another creature you control enters, put a +1/+1 counter on that creature and a +1/+1 counter on this creature."
Railway Brawler74%
$5.81↑#2547↑0.362.5 years↓
"Whenever another creature you control enters, put X +1/+1 counters on it, where X is its power."
Prime Speaker Zegana73%
$0.19↓#28590.2113.7 years
"this card enters with X +1/+1 counters on it, where X is the greatest power among other creatures you control."
Maester Seymour72%
$0.26↓#35930.291.4 years↓
"At the beginning of combat on your turn, put a number of +1/+1 counters equal to this card's power on another target creature you control."
Madame Null, Power Broker72%
$0.37↓#9725↓0.320.6 years↓
"Whenever another creature you control enters, you may pay life equal to its power. If you do, put that many +1/+1 counters on it."
Halana and Alena, Partners72%
$0.39↓#2025↑0.304.9 years↓
"At the beginning of combat on your turn, put X +1/+1 counters on another target creature you control, where X is this card's power. That creature gains haste until end of turn."
Arwen, Weaver of Hope72%
$4.81↑#1870↑0.223.3 years↓
"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 Hunt71%
$0.18↓#29810.14↓6.7 years↓
"Each other creature you control enters with an additional +1/+1 counter on it."
Champion of Lambholt71%
$2.83↑#584↑0.58↑14.5 years
"Whenever another creature you control enters, put a +1/+1 counter on this creature."
Hulkling, Burgeoning Bruiser70%
$0.13↓#21862↓0.190.3 years↓
"Whenever another creature you control enters, if it has greater power or toughness than this card, put a +1/+1 counter on this card."
Serra Redeemer70%
$0.29↓#9063↓0.00↓4.1 years↓
"Whenever another creature you control with power 2 or less enters, put two +1/+1 counters on that creature."
War Machine, Legacy of Iron70%
$0.16↓#20995↓0.200.3 years↓
"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."
Celebrity Fencer70%
$0.20↓#18796↓0.00↓4.5 years↓
"Whenever another creature you control enters, put a +1/+1 counter on this creature."
EPF Point Squad70%
$0.07↓#22367↓0.17↓0.6 years↓
"Whenever another creature you control enters, put a +1/+1 counter on this creature."