Siegehorn Ceratops 
Creature — Dinosaur
$0.57 #12968 0.05 8.6 years
Enrage — Whenever this creature is dealt damage, put two +1/+1 counters on it. (It must survive the damage to get the counters.)
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Cards similar to Siegehorn Ceratops 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.
Snapping Sailback98%
$0.19↓#144690.29↑8.9 years
"Whenever this creature is dealt damage, put a +1/+1 counter on it."
Mockingbird, Bobbi Morse98%
$0.19↓#29045↓0.000.2 years↓
"Whenever this card is dealt damage, put a +1/+1 counter on her."
Hungering Hydra95%
$2.63↑#3588↑0.31↑8.1 years
"Whenever this creature is dealt damage, put that many +1/+1 counters on it."
Hercules, Olympian Hero94%
$0.29↓#16046↓0.000.2 years↓
"Whenever this card is dealt damage for the first time each turn, put that many +1/+1 counters on him."
Venus, Torn Between Worlds94%
$0.21↓#16333↓0.000.5 years↓
"Whenever this card is dealt damage, put that many +1/+1 counters on her."
Rite of Passage94%
$4.80↑#5771↑0.0522.3 years↑
"Whenever a creature you control is dealt damage, put a +1/+1 counter on it."
Fungusaur91%
$0.25↓#23468↓0.31↑33.1 years↑
"Whenever this creature is dealt damage, put a +1/+1 counter on it."
Strong, the Brutish Thespian87%
$0.36↓#6137↑0.21↑2.5 years↓
"Whenever this card is dealt damage, you get three rad counters and put three +1/+1 counters on this card."
War Elemental81%
$5.01↑#133190.1422.9 years↑
"Whenever an opponent is dealt damage, put that many +1/+1 counters on this creature."
Fungus Sliver78%
$0.49↓#133660.33↑19.9 years↑
"All Sliver creatures have "Whenever this creature is dealt damage, put a +1/+1 counter on it.""
Rushwood Elemental74%
$0.98↑#28048↓0.25↑26.9 years↑
"At the beginning of your upkeep, you may put a +1/+1 counter on this creature."
Bellowing Aegisaur74%
$0.18↓#7939↑0.138.9 years
"Whenever this creature is dealt damage, put a +1/+1 counter on each other creature you control."
Furious Spinesplitter73%
$0.23↓#26896↓0.062.5 years↓
"At the beginning of your end step, put a +1/+1 counter on this creature for each opponent who was dealt damage this turn."
Whirling Dervish70%
$0.27↓#28920↓0.37↑32.3 years↑
"At the beginning of each end step, if this creature dealt damage to an opponent this turn, put a +1/+1 counter on it."
Child of the Volcano70%
$0.10↓#22835↓0.46↑2.8 years↓
"At the beginning of your end step, if you descended this turn, put a +1/+1 counter on this creature."
Basim Ibn Ishaq70%
$2.39↑#3118↑0.32↑2.2 years↓
"Whenever this card deals combat damage to a player, put a +1/+1 counter on it."
Dunerider Outlaw70%
$0.05↓#27067↓0.31↑19.6 years↑
"At the beginning of each end step, if this creature dealt damage to an opponent this turn, put a +1/+1 counter on it."
Wandertale Mentor70%
$0.23↓#4755↑0.002.1 years↓
"Whenever you expend 4, put a +1/+1 counter on this creature."