Mossdog 
Creature — Plant Dog
$0.11 #28391 0.00 26.7 years
Whenever this creature becomes the target of a spell or ability an opponent controls, put a +1/+1 counter on this creature.
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Cards similar to Mossdog expected a card that isn't here?
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Angelic Cub87%
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"Whenever this creature becomes the target of a spell or ability for the first time each turn, put a +1/+1 counter on it."
Swarm Shambler86%
$0.19↑#15392↑0.076.1 years↓
"Whenever a creature you control with a +1/+1 counter on it becomes the target of a spell an opponent controls, create a 1/1 green Insect creature token."
Retromancer84%
$0.17↑#312740.11↑28.0 years↑
"Whenever this creature becomes the target of a spell or ability, this creature deals 3 damage to that spell or ability's controller."
Rushwood Elemental84%
$1.04↑#283340.0027.0 years
"At the beginning of your upkeep, you may put a +1/+1 counter on this creature."
Seedglaive Mentor80%
$0.22↑#11697↑0.002.2 years↓
"Whenever this creature becomes the target of a spell or ability you control for the first time each turn, put a +1/+1 counter on it."
Task Force80%
$0.20↑#246990.0527.0 years
"Whenever this creature becomes the target of a spell or ability, it gets +0/+3 until end of turn."
Angelic Protector80%
$0.18↑#254980.0029.0 years↑
"Whenever this creature becomes the target of a spell or ability, this creature gets +0/+3 until end of turn."
Child of the Volcano79%
$0.12↑#233220.062.9 years↓
"At the beginning of your end step, if you descended this turn, put a +1/+1 counter on this creature."
Pawpatch Recruit78%
$0.41↑#8771↑0.11↑2.2 years↓
"Whenever a creature you control becomes the target of a spell or ability an opponent controls, put a +1/+1 counter on target creature you control other than that creature."
War Elemental78%
$5.18↑#13554↑0.0023.0 years↓
"Whenever an opponent is dealt damage, put that many +1/+1 counters on this creature."
Thorn Lieutenant78%
$0.26↑#22104↑0.068.3 years↓
"Whenever this creature becomes the target of a spell or ability an opponent controls, create a 1/1 green Elf Warrior creature token."
Savageborn Hydra77%
$0.45↑#11740↑0.12↑13.5 years↓
"This creature enters with X +1/+1 counters on it."
Big Bertha77%
$0.31↑#233500.38↑0.3 years↓
"this card enters with X +1/+1 counters on her."
Air Nomad Student76%
$0.17↑#247350.090.9 years↓
"At the beginning of your end step, if this creature didn't attack this turn, put a +1/+1 counter on it."
Deep Goblin Skulltaker76%
$0.15↑#19093↑0.002.9 years↓
"At the beginning of your end step, if you descended this turn, put a +1/+1 counter on this creature."
Shield Mare76%
$0.12↑#15475↑0.008.3 years↓
"When this creature enters or becomes the target of a spell or ability an opponent controls, you gain 3 life."
Luminarch Aspirant75%
$0.36↑#3910↑0.066.1 years↓
"At the beginning of combat on your turn, put a +1/+1 counter on target creature you control."
Heartfire Hero74%
$0.30↑#8014↑0.21↑2.2 years↓
"Whenever this creature becomes the target of a spell or ability you control for the first time each turn, put a +1/+1 counter on it."
Knight of Wundagore74%
$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."
Petrahydrox74%
$0.06↓#307350.29↑20.7 years↓
"When this creature becomes the target of a spell or ability, return this creature to its owner's hand."