Citanul Druid 
Creature — Human Druid
$8.63 #28175 0.53 32.5 years
Whenever an opponent casts an artifact spell, put a +1/+1 counter on this creature.
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Taurean Mauler90%
$0.56↓#947↑0.31↓18.6 years↓
"Whenever an opponent casts a spell, you may put a +1/+1 counter on this creature."
Infested Roothold88%
$0.26↓#229940.00↓22.6 years↓
"Whenever an opponent casts an artifact spell, you may create a 1/1 green Insect creature token."
Golem's Heart85%
$0.24↓#13415↑0.00↓15.9 years↓
"Whenever a player casts an artifact spell, you may gain 1 life."
Sunscorch Regent84%
$0.30↓#1686↑0.29↓11.4 years↓
"Whenever an opponent casts a spell, put a +1/+1 counter on this creature and you gain 1 life."
Ishai, Ojutai Dragonspeaker84%
$3.29↓#4668↑0.599.8 years↓
"Whenever an opponent casts a spell, put a +1/+1 counter on this card."
Managorger Hydra80%
$0.99↓#997↑0.4811.1 years↓
"Whenever a player casts a spell, put a +1/+1 counter on this creature."
Thundering Mightmare80%
$0.39↓#10837↑0.33↓4.8 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.""
Dragonlair Spider80%
$0.47↓#8231↑0.10↓14.3 years↓
"Whenever an opponent casts a spell, create a 1/1 green Insect creature token."
Medusa, Inhuman Queen79%
$0.27↓#18977↑0.00↓0.2 years↓
"Whenever a player casts a noncreature spell, put a +1/+1 counter on this card."
Predatory Hunger79%
$0.65↓#10710↑0.00↓28.2 years↓
"Whenever an opponent casts a creature spell, put a +1/+1 counter on enchanted creature."
Noosegraf Mob77%
$0.29↓#10793↑0.33↓10.1 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 Sentry76%
$0.33↓#22304↑0.00↓25.6 years↓
"Whenever an opponent casts a spell, this creature gets +2/+2 until end of turn."
Urza's Chalice76%
$1.19↓#239830.24↓32.5 years
"Whenever a player casts an artifact spell, you may pay . If you do, you gain 1 life."
. If you do, you gain 1 life."
Steelburr Champion76%
$0.28↓#6838↑0.24↓2.1 years↓
"Whenever an opponent casts a noncreature spell, put a +1/+1 counter on this creature."
Mold Adder75%
$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."
Witchstalker75%
$0.25↓#19122↑0.27↓13.1 years↓
"Whenever an opponent casts a blue or black spell during your turn, put a +1/+1 counter on this creature."
Chimeric Egg74%
$0.23↓#233920.35↓22.6 years↓
"Whenever an opponent casts a nonartifact spell, put a charge counter on this artifact."
Forgotten Ancient74%
$0.38↓#390↑0.37↓23.3 years↓
"Whenever a player casts a spell, you may put a +1/+1 counter on this creature."
Dirtcowl Wurm74%
$2.32↓#15889↑0.41↓28.9 years↓
"Whenever an opponent plays a land, put a +1/+1 counter on this creature."
April O'Neil, Human Element72%
$4.15↓#12707↑0.00↓0.5 years↓
"Whenever a player casts an artifact, instant, or sorcery spell, you create a Mutagen token."