Taurean Mauler 
Creature — Shapeshifter
$0.56 #947 0.31 18.6 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%
$0.99↑#9970.48↑11.1 years↓
"Whenever a player casts a spell, put a +1/+1 counter on this creature."
Ishai, Ojutai Dragonspeaker97%
$3.29↑#4668↓0.59↑9.8 years↓
"Whenever an opponent casts a spell, put a +1/+1 counter on this card."
Sunscorch Regent96%
$0.30↓#1686↓0.2911.4 years↓
"Whenever an opponent casts a spell, put a +1/+1 counter on this creature and you gain 1 life."
Thundering Mightmare92%
$0.39↓#10837↓0.334.8 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%
$0.65↑#10710↓0.00↓28.2 years↑
"Whenever an opponent casts a creature spell, put a +1/+1 counter on enchanted creature."
Forgotten Ancient90%
$0.38↓#390↑0.3723.3 years↑
"Whenever a player casts a spell, you may put a +1/+1 counter on this creature."
+1 more matching line
Medusa, Inhuman Queen90%
$0.27↓#18977↓0.00↓0.2 years↓
"Whenever a player casts a noncreature spell, put a +1/+1 counter on this card."
Citanul Druid90%
$8.63↑#28175↓0.53↑32.5 years↑
"Whenever an opponent casts an artifact spell, put a +1/+1 counter on this creature."
Titania's Chosen89%
$0.31↓#17141↓0.06↓27.9 years↑
"Whenever a player casts a green spell, put a +1/+1 counter on this creature."
Mold Adder89%
$0.11↓#14542↓0.00↓17.1 years↓
"Whenever an opponent casts a blue or black spell, you may put a +1/+1 counter on this creature."
Witchstalker88%
$0.25↓#19122↓0.2713.1 years↓
"Whenever an opponent casts a blue or black spell during your turn, put a +1/+1 counter on this creature."
Steelburr Champion88%
$0.28↓#6838↓0.242.1 years↓
"Whenever an opponent casts a noncreature spell, put a +1/+1 counter on this creature."
Dragonlair Spider82%
$0.47↓#8231↓0.10↓14.3 years↓
"Whenever an opponent casts a spell, create a 1/1 green Insect creature token."
Noosegraf Mob80%
$0.29↓#10793↓0.3310.1 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%
$0.33↓#22304↓0.00↓25.6 years↑
"Whenever an opponent casts a spell, this creature gets +2/+2 until end of turn."
Elvish Handservant78%
$0.13↓#30326↓0.53↑18.9 years
"Whenever a player casts a Giant spell, you may put a +1/+1 counter on this creature."
Dirtcowl Wurm76%
$2.32↑#15889↓0.4128.9 years↑
"Whenever an opponent plays a land, put a +1/+1 counter on this creature."
Witch-Maw Nephilim74%
$1.11↑#20308↓0.07↓20.6 years↑
"Whenever you cast a spell, you may put two +1/+1 counters on this creature."
Rewards of Diversity72%
$0.43↓#21851↓0.06↓25.9 years↑
"Whenever an opponent casts a multicolored spell, you gain 4 life."
Eyes of the Wisent72%
$0.59↑#22472↓0.2518.9 years
"Whenever an opponent casts a blue spell during your turn, you may create a 4/4 green Elemental creature token."