Planet Killer 
Artifact Creature — Construct
€0.96 #23666 0.0 years
Flying, indestructible
This creature attacks each combat if able.
Whenever this creature deals combat damage to a player, put a +1/+1 counter on it for each land that player controls.
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Cards similar to Planet Killer 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.
Bloodcrazed Neonate90%
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"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
+1 more matching line
Berserkers of Blood Ridge88%
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"This creature attacks each combat if able."
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"Whenever this creature deals combat damage to a player, put two +1/+1 counters on it."