Forgotten Ancient 
Creature — Elemental
$0.34 #390 0.44 23.4 years
Whenever a player casts a spell, you may put a +1/+1 counter on this creature.
At the beginning of your upkeep, you may move any number of +1/+1 counters from this creature onto other creatures.
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Managorger Hydra94%
$0.36↑#1022↓0.4811.3 years↓
"Whenever a player casts a spell, put a +1/+1 counter on this creature."
Taurean Mauler90%
$0.41↑#956↓0.3818.7 years↓
"Whenever an opponent casts a spell, you may put a +1/+1 counter on this creature."
Ishai, Ojutai Dragonspeaker85%
$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↓0.3611.6 years↓
"Whenever an opponent casts a spell, put a +1/+1 counter on this creature and you gain 1 life."
Thundering Mightmare82%
$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.""
Scrounging Bandar82%
$0.15↓#8879↓0.00↓9.7 years↓
"At the beginning of your upkeep, you may move any number of +1/+1 counters from this creature onto another target creature."
Titania's Chosen82%
$0.27↓#17453↓0.06↓28.0 years↑
"Whenever a player casts a green spell, put a +1/+1 counter on this creature."
Predatory Hunger82%
$0.61↑#10864↓0.11↓28.3 years↑
"Whenever an opponent casts a creature spell, put a +1/+1 counter on enchanted 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."
Medusa, Inhuman Queen78%
$0.27↓#17923↓0.430.3 years↓
"Whenever a player casts a noncreature spell, put a +1/+1 counter on this card."
Mold Adder78%
$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."
Steel Dromedary78%
$0.21↓#23928↓0.00↓5.3 years↓
"At the beginning of combat on your turn, you may move a +1/+1 counter from this creature onto target creature."
+1 more matching line
Witchstalker77%
$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."
Cytoplast Root-Kin76%
$0.11↓#18625↓0.06↓20.5 years↓
"
: Move a +1/+1 counter from target creature you control onto this creature."
: Move a +1/+1 counter from target creature you control onto this creature."
Arcbound Fiend75%
$0.36↑#13330↓0.00↓22.7 years
"At the beginning of your upkeep, you may move a +1/+1 counter from target creature onto this creature."
Steelburr Champion75%
$0.37↑#7006↓0.26↓2.2 years↓
"Whenever an opponent casts a noncreature spell, put a +1/+1 counter on this creature."
Aetherborn Marauder75%
$0.09↓#16873↓0.07↓10.1 years↓
"When this creature enters, move any number of +1/+1 counters from other permanents you control onto this creature."
Citanul Druid74%
$8.33↑#28629↓0.21↓32.6 years↑
"Whenever an opponent casts an artifact spell, put a +1/+1 counter on this creature."
Fairgrounds Trumpeter74%
$0.09↓#19957↓0.00↓10.1 years↓
"At the beginning of each end step, if a +1/+1 counter was put on a permanent under your control this turn, put a +1/+1 counter on this creature."
Knight of Wundagore73%
$0.08↓#19783↓0.11↓0.3 years↓
"Whenever you put a +1/+1 counter on another creature, put a +1/+1 counter on this creature. This ability triggers only once each turn."