Quilled Greatwurm {4}{G}{G}
Creature — Wurm
Trample
Whenever a creature you control deals combat damage during your turn, put that many +1/+1 counters on it. (It must survive to get the counters.)
You may cast this card from your graveyard by removing six counters from among creatures you control in addition to paying its other costs.
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Cards that do something similar 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.
Necropolis Regent 94%
$0.55#3951
"Whenever a creature you control deals combat damage to a player, put that many +1/+1 counters on it."
Shaman of the Great Hunt 89%
$0.98#11770
"Whenever a creature you control deals combat damage to a player, put a +1/+1 counter on it."
Sphere Grid 88%
$8.87#1407
"Whenever a creature you control deals combat damage to a player, put a +1/+1 counter on that creature."
Cazur, Ruthless Stalker 88%
$0.38#7935
"Whenever a creature you control deals combat damage to a player, put a +1/+1 counter on that creature."
Noble Purpose 83%
$0.67#15295
"Whenever a creature you control deals combat damage, you gain that much life."
Vincent, Vengeful Atoner 81%
$0.32#4321
"Whenever one or more creatures you control deal combat damage to a player, put a +1/+1 counter on this card."
Conclave Sledge-Captain 80%
$1.76#7205
"Whenever this creature deals combat damage to a player, put that many +1/+1 counters on it."
Westgate Regent 80%
$0.31#13389
"Whenever this creature deals combat damage to a player, put that many +1/+1 counters on it."