Master Biomancer 
Creature — Elf Wizard
$0.80 #3151 0.22 13.6 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?
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Shelinda, Yevon Acolyte86%
$0.25↓#5586↓0.47↑1.2 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."
Olivia, Mobilized for War76%
$0.66↓#10768↓0.00↓10.4 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%
$1.54↑#4280↓0.33↑1.2 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%
$0.20↓#35090.177.2 years↓
"Whenever another creature you control enters, put a +1/+1 counter on that creature."
Railway Brawler74%
$5.84↑#2492↑0.36↑2.4 years↓
"Whenever another creature you control enters, put X +1/+1 counters on it, where X is its power."
Hamletback Goliath74%
$0.19↓#9036↓0.00↓18.9 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↓#7980↓0.00↓21.0 years↑
"Whenever another creature you control enters, put a +1/+1 counter on that creature and a +1/+1 counter on this creature."
Prime Speaker Zegana73%
$0.19↓#28050.2613.6 years
"this card enters with X +1/+1 counters on it, where X is the greatest power among other creatures you control."
Maester Seymour72%
$0.27↓#37440.37↑1.2 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%
$0.38↓#10226↓0.00↓0.5 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%
$0.21↓#1998↑0.294.8 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%
$5.03↑#1868↑0.32↑3.2 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↓#28280.136.6 years↓
"Each other creature you control enters with an additional +1/+1 counter on it."
Champion of Lambholt71%
$2.96↑#567↑0.58↑14.3 years
"Whenever another creature you control enters, put a +1/+1 counter on this creature."
Hulkling, Burgeoning Bruiser70%
$0.19↓#22539↓0.00↓0.2 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↓#8829↓0.284.0 years↓
"Whenever another creature you control with power 2 or less enters, put two +1/+1 counters on that creature."
Tribute to the World Tree70%
$13.68↑#604↑0.42↑3.4 years↓
"Whenever a creature you control enters, draw a card if its power is 3 or greater. Otherwise, put two +1/+1 counters on it."
War Machine, Legacy of Iron70%
$0.17↓#21792↓0.00↓0.2 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."
EPF Point Squad70%
$0.09↓#22564↓0.00↓0.5 years↓
"Whenever another creature you control enters, put a +1/+1 counter on this creature."
Celebrity Fencer70%
$0.17↓#18387↓0.234.4 years↓
"Whenever another creature you control enters, put a +1/+1 counter on this creature."