Madame Null, Power Broker 
Legendary Creature — Demon Advisor
$0.37 #9725 0.32 0.6 years
Deathtouch
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.
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Cards similar to Madame Null, Power Broker expected a card that isn't here?
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Railway Brawler90%
$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."
Devilish Valet83%
$0.32↓#3519↑0.244.5 years↑
"Whenever another creature you control enters, double this creature's power until end of turn."
Good-Fortune Unicorn82%
$0.28↓#3546↑0.15↓7.4 years↑
"Whenever another creature you control enters, put a +1/+1 counter on that creature."
Shelinda, Yevon Acolyte80%
$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."
Juniper Order Ranger80%
$0.15↓#82480.18↓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."
God-Eternal Rhonas80%
$8.56↑#5032↑0.417.5 years↑
"Deathtouch"
Hamletback Goliath78%
$0.20↓#92180.06↓19.0 years↑
"Whenever another creature enters, you may put X +1/+1 counters on this creature, where X is that creature's power."
Arni, Renowned Champion77%
$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."
Serra Redeemer76%
$0.29↓#90630.00↓4.1 years↑
"Whenever another creature you control with power 2 or less enters, put two +1/+1 counters on that creature."
Ezuri, Claw of Progress76%
$2.01↑#5693↑0.43↑10.9 years↑
"Whenever a creature you control with power 2 or less enters, you get an experience counter."
Treetop Snarespinner76%
$0.22↓#84430.06↓1.9 years↑
"Deathtouch"
Celebrity Fencer76%
$0.20↓#18796↓0.00↓4.5 years↑
"Whenever another creature you control enters, put a +1/+1 counter on this creature."
EPF Point Squad76%
$0.07↓#22367↓0.17↓0.6 years
"Whenever another creature you control enters, put a +1/+1 counter on this creature."
Thickest in the Thicket76%
$0.26↓#3036↑0.16↓2.2 years↑
"When this enchantment enters, put X +1/+1 counters on target creature, where X is that creature's power."
Hulkling, Burgeoning Bruiser74%
$0.13↓#21862↓0.19↓0.3 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."
Durable Handicraft73%
$0.08↓#20600↓0.07↓10.1 years↑
"Whenever a creature you control enters, you may pay 
. If you do, put a +1/+1 counter on that creature."
. If you do, put a +1/+1 counter on that creature."
Yorvo, Lord of Garenbrig73%
$0.29↓#95390.377.0 years↑
"Whenever another green creature you control enters, put a +1/+1 counter on this card. Then if that creature's power is greater than this card's power, put another +1/+1 counter on this card."
Mabel, Valley Hero73%
$0.20↓#21925↓0.09↓0.0 years
"Whenever this card or another creature you control enters, put a +1/+1 counter on target creature that entered this turn."
Master Biomancer72%
$0.84↑#3231↑0.2813.7 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."
Tribute to the World Tree72%
$14.27↑#615↑0.413.5 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."