Mold Adder 
Creature — Fungus Snake
$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.
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Cards similar to Mold Adder expected a card that isn't here?
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Witchstalker100%
$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."
Snake Pit89%
$0.28↑#140730.1227.0 years↑
"Whenever an opponent casts a blue or black spell, you may create a 1/1 green Snake creature token."
Taurean Mauler89%
$0.41↑#956↑0.38↑18.7 years↑
"Whenever an opponent casts a spell, you may put a +1/+1 counter on this creature."
Managorger Hydra87%
$0.36↑#1022↑0.48↑11.3 years↓
"Whenever a player casts a spell, put a +1/+1 counter on this creature."
Ishai, Ojutai Dragonspeaker86%
$3.68↑#4727↑0.56↑9.9 years↓
"Whenever an opponent casts a spell, put a +1/+1 counter on this card."
Sunscorch Regent85%
$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 Chosen80%
$0.27↑#174530.06↓28.0 years↑
"Whenever a player casts a green spell, put a +1/+1 counter on this creature."
Thundering Mightmare80%
$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.""
Eyes of the Wisent80%
$0.58↑#23049↓0.1119.0 years↑
"Whenever an opponent casts a blue spell during your turn, you may create a 4/4 green Elemental creature token."
Predatory Hunger80%
$0.61↑#10864↑0.1128.3 years↑
"Whenever an opponent casts a creature spell, put a +1/+1 counter on enchanted creature."
Forgotten Ancient78%
$0.34↑#390↑0.44↑23.4 years↑
"Whenever a player casts a spell, you may put a +1/+1 counter on this creature."
Purraj of Urborg76%
$0.97↑#28958↓0.00↓30.0 years↑
"Whenever a player casts a black spell, you may pay 
. If you do, put a +1/+1 counter on Purraj."
. If you do, put a +1/+1 counter on Purraj."
Kraken's Eye76%
$0.10↓#156760.05↓22.7 years↑
"Whenever a player casts a blue spell, you may gain 1 life."
Crystal Rod76%
$0.14↑#26801↓0.00↓33.2 years↑
"Whenever a player casts a blue spell, you may pay 
. If you do, you gain 1 life."
. If you do, you gain 1 life."
Freyalise's Charm76%
$0.16↑#29946↓0.35↑31.4 years↑
"Whenever an opponent casts a black spell, you may pay . If you do, you draw a card."
. If you do, you draw a card."
Demon's Horn76%
$0.21↑#6565↑0.1222.7 years↑
"Whenever a player casts a black spell, you may gain 1 life."
Medusa, Inhuman Queen76%
$0.27↑#17923↓0.43↑0.3 years↓
"Whenever a player casts a noncreature spell, put a +1/+1 counter on this card."
Sol'kanar the Swamp King75%
$0.17↑#20022↓0.1232.4 years↑
"Whenever a player casts a black spell, you gain 1 life."
Citanul Druid75%
$8.33↑#28629↓0.2132.6 years↑
"Whenever an opponent casts an artifact spell, put a +1/+1 counter on this creature."
Throne of Bone74%
$0.16↑#24594↓0.06↓33.2 years↑
"Whenever a player casts a black spell, you may pay . If you do, you gain 1 life."
. If you do, you gain 1 life."