Niffler, Adorable Troublemaker

Indestructible, Hexproof
{g}{w}: Draw a card, create a colorless artifact treasure token with, {t}, Sacrifice this artifact: Add one mana of any color to your mana pool.
At the beginning of each upkeep, create a colorless artifact treasure token with, {t}, Sacrifice this artifact: Add one mana of any color to your mana pool.