Coastline Marauders {2}{R}
Creature — Human Pirate
Trample
Whenever this creature attacks, it gets +1/+0 until end of turn for each land defending player controls.
Encore {4}{R}{R} ({4}{R}{R}, Exile this card from your graveyard: For each opponent, create a token copy that attacks that opponent this turn if able. They gain haste. Sacrifice them at the beginning of the next end step. Activate only as a sorcery.)
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Cards that do something similar expected a card that isn't here?
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Rampaging Brontodon 87%
$0.57#3838
"Whenever this creature attacks, it gets +1/+1 until end of turn for each land you control."
+1 more matching line
Terra Ravager 85%
$0.06#25564
"Whenever this creature attacks, it gets +X/+0 until end of turn, where X is the number of lands defending player controls."