Kerser, Rogue Prince

+2: Create 2 colorless artifact tokens named Gold. They have "Sacrifice this artifact: Add one mana of any color to your mana pool."
0: Put a loyalty counter on Kerser, Rogue Prince for each artifact you control.
-20: Kerser, Rogue Prince becomes a 20/20 indestructible human warrior creature with hexproof, trample, and haste until end of turn.