Troban Nubby, Charm Collector

Whenever you cast a spell with the word
"Charm" in it's name, create a Gold token.
(It's an artifact with "Sacrifice this artifact:
Add one mana of any color.")
{w}{u}{b}{r}{g}: Create Pot of Gold, a legendary
colorless artifact token with "Whenever you
cast a multicolored spell, draw a card." and
"{t}: Create a Gold token."