War Elemental 
Creature — Elemental
$5.01 #13319 0.14 22.9 years
When this creature enters, sacrifice it unless an opponent was dealt damage this turn.
Whenever an opponent is dealt damage, put that many +1/+1 counters on this creature.
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Cards similar to War Elemental 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.
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"Whenever this card deals combat damage to a player, you may pay 
. If you do, put six +1/+1 counters on this card."
. If you do, put six +1/+1 counters on this card."
Dunerider Outlaw84%
$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."
Air Nomad Student84%
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"At the beginning of your end step, if this creature didn't attack this turn, put a +1/+1 counter on it."
Knight of Wundagore84%
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"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."
Snapping Sailback83%
$0.19↓#144690.29↑8.9 years↓
"Whenever this creature is dealt damage, put a +1/+1 counter on it."
Mockingbird, Bobbi Morse82%
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"Whenever this card is dealt damage, put a +1/+1 counter on her."
Botanical Brawler82%
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"Whenever one or more +1/+1 counters are put on another permanent you control, if it's the first time +1/+1 counters have been put on that permanent this turn, put a +1/+1 counter on this creature."
Mirri the Cursed82%
$0.57↓#9790↑0.00↓19.6 years↓
"Whenever Mirri deals combat damage to a creature, put a +1/+1 counter on Mirri."
Retaliator Griffin82%
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"Whenever a source an opponent controls deals damage to you, you may put that many +1/+1 counters on this creature."
Enduring Scalelord82%
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"Whenever one or more +1/+1 counters are put on another creature you control, you may put a +1/+1 counter on this creature."
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"Whenever this creature is dealt damage, put two +1/+1 counters on it."
Sengir Connoisseur80%
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"Whenever one or more other creatures die, put a +1/+1 counter on this creature. This ability triggers only once each turn."
Kazarov, Sengir Pureblood80%
$0.24↓#21815↓0.64↑8.4 years↓
"Whenever a creature an opponent controls is dealt damage, put a +1/+1 counter on this card."
Fairgrounds Trumpeter80%
$0.10↓#19573↓0.53↑9.9 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."
Hungering Hydra79%
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"Whenever this creature is dealt damage, put that many +1/+1 counters on it."
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"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
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"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."