Mossdog 
Creature — Plant Dog
$0.11 #27980 0.00 26.6 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?
Reports become test cases the matcher is graded against before an update ships. Delvefall isn't a chatbot guessing, it compares the printed rules text of every card with plain math, and examples like yours decide which differences should count.
Angelic Cub87%
$0.26↑#15602↑0.20↑3.8 years↓
"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↑#15078↑0.26↑5.9 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%
$0.15↑#309920.0027.9 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%
$0.98↑#280480.25↑26.9 years
"At the beginning of your upkeep, you may put a +1/+1 counter on this creature."
Seedglaive Mentor81%
$0.22↑#11470↑0.53↑2.1 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%
$0.19↑#244980.0526.9 years
"Whenever this creature becomes the target of a spell or ability, it gets +0/+3 until end of turn."
Angelic Protector80%
$0.15↑#254300.64↑28.9 years↑
"Whenever this creature becomes the target of a spell or ability, this creature gets +0/+3 until end of turn."
Child of the Volcano80%
$0.10↓#228350.46↑2.8 years↓
"At the beginning of your end step, if you descended this turn, put a +1/+1 counter on this creature."
Pawpatch Recruit79%
$0.58↑#8507↑0.002.1 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 Elemental79%
$5.01↑#13319↑0.14↑22.9 years↓
"Whenever an opponent is dealt damage, put that many +1/+1 counters on this creature."
Thorn Lieutenant78%
$0.22↑#21757↑0.24↑8.1 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 Hydra78%
$0.46↑#11456↑0.31↑13.3 years↓
"This creature enters with X +1/+1 counters on it."
Big Bertha78%
$0.28↑#241550.000.2 years↓
"this card enters with X +1/+1 counters on her."
Air Nomad Student77%
$0.17↑#248100.000.8 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 Skulltaker77%
$0.18↑#18687↑0.002.8 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↑#15438↑0.62↑8.1 years↓
"When this creature enters or becomes the target of a spell or ability an opponent controls, you gain 3 life."
Knight of Wundagore75%
$0.09↓#21078↑0.000.2 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."
Heartfire Hero74%
$0.32↑#7934↑0.33↑2.1 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."
Enduring Scalelord74%
$0.13↑#11165↑0.20↑11.4 years↓
"Whenever one or more +1/+1 counters are put on another creature you control, you may put a +1/+1 counter on this creature."
Petrahydrox74%
$0.06↓#305260.0020.6 years↓
"When this creature becomes the target of a spell or ability, return this creature to its owner's hand."