Managorger Hydra 
Creature — Hydra
$0.36 #1022 0.48 11.3 years
Trample
Whenever a player casts a spell, put a +1/+1 counter on this creature.
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Taurean Mauler98%
$0.41↑#9560.3818.7 years↑
"Whenever an opponent casts a spell, you may put a +1/+1 counter on this creature."
Ishai, Ojutai Dragonspeaker95%
$3.68↑#4727↓0.569.9 years↓
"Whenever an opponent casts a spell, put a +1/+1 counter on this card."
Forgotten Ancient94%
$0.34↓#390↑0.4423.4 years↑
"Whenever a player casts a spell, you may put a +1/+1 counter on this creature."
Sunscorch Regent94%
$0.31↓#1629↓0.36↓11.6 years
"Whenever an opponent casts a spell, put a +1/+1 counter on this creature and you gain 1 life."
Titania's Chosen91%
$0.27↓#17453↓0.06↓28.0 years↑
"Whenever a player casts a green spell, put a +1/+1 counter on this creature."
Thundering Mightmare90%
$0.42↑#11160↓0.28↓4.9 years↓
"As long as this card is paired with another creature, each of those creatures has "Whenever an opponent casts a spell, put a +1/+1 counter on this creature.""
Predatory Hunger88%
$0.61↑#10864↓0.11↓28.3 years↑
"Whenever an opponent casts a creature spell, put a +1/+1 counter on enchanted creature."
Medusa, Inhuman Queen88%
$0.27↓#17923↓0.430.3 years↓
"Whenever a player casts a noncreature spell, put a +1/+1 counter on this card."
Mold Adder87%
$0.12↓#14685↓0.20↓17.3 years↑
"Whenever an opponent casts a blue or black spell, you may put a +1/+1 counter on this creature."
Witchstalker87%
$0.29↓#19155↓0.00↓13.3 years↑
"Whenever an opponent casts a blue or black spell during your turn, put a +1/+1 counter on this creature."
Steelburr Champion83%
$0.37↑#7006↓0.26↓2.2 years↓
"Whenever an opponent casts a noncreature spell, put a +1/+1 counter on this creature."
Elvish Handservant82%
$0.11↓#30641↓0.00↓19.0 years↑
"Whenever a player casts a Giant spell, you may put a +1/+1 counter on this creature."
Noosegraf Mob82%
$0.27↓#11109↓0.13↓10.2 years↓
"Whenever a player casts a spell, remove a +1/+1 counter from this creature. If you do, create a 2/2 black Zombie creature token."
Citanul Druid80%
$8.33↑#28629↓0.21↓32.6 years↑
"Whenever an opponent casts an artifact spell, put a +1/+1 counter on this creature."
Scab-Clan Mauler78%
$0.04↓#27657↓0.10↓21.2 years↑
"Trample"
Guardian of the Halls78%
$0.09↓#19249↓0.08↓0.2 years↓
"Trample"
Witch-Maw Nephilim77%
$1.32↑#19824↓0.05↓20.7 years↑
"Whenever you cast a spell, you may put two +1/+1 counters on this creature."
Dirtcowl Wurm76%
$2.30↑#16235↓0.67↑29.1 years↑
"Whenever an opponent plays a land, put a +1/+1 counter on this creature."
Hobblefiend75%
$0.29↓#16303↓0.00↓6.3 years↓
"Trample"
Machinesmith Automaton74%
$0.15↓#16390↓0.15↓0.3 years↓
"Trample"