Captain Lannery Storm {2}{R}
Legendary Creature — Human Pirate
Haste
Whenever Captain Lannery Storm attacks, create a Treasure token. (It's an artifact with "{T}, Sacrifice this token: Add one mana of any color.")
Whenever you sacrifice a Treasure, Captain Lannery Storm gets +1/+0 until end of turn.
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Cards that do something similar expected a card that isn't here?
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The Belligerent 97%
$0.29#6545
"Whenever this card attacks, create a Treasure token. Until end of turn, you may look at the top card of your library any time, and you may play lands and cast spells from the top of your library."
Loot Dispute 87%
$0.25#10710
"Whenever you attack the player who has the initiative, create a Treasure token."
Jolene, the Plunder Queen 84%
$9.98#4537
"Whenever a player attacks one or more of your opponents, that attacking player creates a Treasure token."
+1 more matching line
Jolene, Plundering Pugilist 83%
$0.21#9293
"Whenever you attack with one or more creatures with power 4 or greater, create a Treasure token."
Iron Man, Titan of Innovation 82%
$12.74#6256
"Whenever this card attacks, create a Treasure token, then you may sacrifice a noncreature artifact. If you do, search your library for an artifact card with mana value equal to 1 plus the sacrificed artifact's mana value, put it onto the battlefield tapped, then shuffle."