Taurean Mauler 
Creature — Shapeshifter
$0.41 #956 0.38 18.7 years
Changeling (This card is every creature type.)
Whenever an opponent casts a spell, you may put a +1/+1 counter on this creature.
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Managorger Hydra98%
$0.36↓#10220.4811.3 years↓
"Whenever a player casts a spell, put a +1/+1 counter on this creature."
Ishai, Ojutai Dragonspeaker97%
$3.68↑#4727↓0.56↑9.9 years↓
"Whenever an opponent casts a spell, put a +1/+1 counter on this card."
Sunscorch Regent96%
$0.31↓#1629↓0.3611.6 years↓
"Whenever an opponent casts a spell, put a +1/+1 counter on this creature and you gain 1 life."
Thundering Mightmare92%
$0.42↑#11160↓0.284.9 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 Hunger92%
$0.61↑#10864↓0.11↓28.3 years↑
"Whenever an opponent casts a creature spell, put a +1/+1 counter on enchanted creature."
Forgotten Ancient90%
$0.34↓#390↑0.4423.4 years↑
"Whenever a player casts a spell, you may put a +1/+1 counter on this creature."
+1 more matching line
Citanul Druid90%
$8.33↑#28629↓0.21↓32.6 years↑
"Whenever an opponent casts an artifact spell, put a +1/+1 counter on this creature."
Medusa, Inhuman Queen89%
$0.27↓#17923↓0.430.3 years↓
"Whenever a player casts a noncreature spell, put a +1/+1 counter on this card."
Mold Adder89%
$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."
Titania's Chosen88%
$0.27↓#17453↓0.06↓28.0 years↑
"Whenever a player casts a green spell, put a +1/+1 counter on this creature."
Witchstalker88%
$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 Champion87%
$0.37↓#7006↓0.26↓2.2 years↓
"Whenever an opponent casts a noncreature spell, put a +1/+1 counter on this creature."
Dragonlair Spider82%
$0.49↑#8367↓0.3114.4 years↓
"Whenever an opponent casts a spell, create a 1/1 green Insect creature token."
Noosegraf Mob80%
$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."
Mogg Sentry80%
$0.32↓#22626↓0.12↓25.7 years↑
"Whenever an opponent casts a spell, this creature gets +2/+2 until end of turn."
Elvish Handservant78%
$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."
Solarium Sentry77%
$0.31↓#19077↓0.15↓0.0 years↓
"Whenever an opponent casts a spell with mana value 2 or less, you gain 2 life."
Dirtcowl Wurm76%
$2.30↑#16235↓0.67↑29.1 years↑
"Whenever an opponent plays a land, put a +1/+1 counter on this creature."
Witch-Maw Nephilim74%
$1.32↑#19824↓0.05↓20.7 years↑
"Whenever you cast a spell, you may put two +1/+1 counters on this creature."
Rewards of Diversity72%
$0.43↑#21896↓0.2826.0 years↑
"Whenever an opponent casts a multicolored spell, you gain 4 life."