Contract Hero {2}{R}
Creature — Human Mercenary Hero
When this creature enters, create a Treasure token. (It's an artifact with "{T}, Sacrifice this token: Add one mana of any color.")
Whenever this creature attacks, you may sacrifice an artifact or discard a card. If you do, this creature gets +2/+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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Reckless Detective 94%
$0.15#19825
"Whenever this creature attacks, you may sacrifice an artifact or discard a card. If you do, draw a card and this creature gets +2/+0 until end of turn."
Comet Crawler 81%
$0.19#18242
"Whenever this creature attacks, you may sacrifice another creature or artifact. If you do, this creature gets +2/+0 until end of turn."
Seraph of New Capenna // Seraph of New Phyrexia 81%
$0.15#25475
"Whenever this creature attacks, you may sacrifice another creature or artifact. If you do, this creature gets +2/+1 until end of turn."