Thargelion Mercenary

Gemcut 1 (When this creature enters the battlefield,
put a +1/+1 counter on it, or create a treasure token.)
Thargelion Mercenary can't block.
Whenever Thargelion Mercenary deals combat
damage to a player, create a treasure token.
(It's an artifact with "{t}, Sacrifice this artifact: Add
one mana of any color.")