Mammonic, Demon of Greed

Indestructible
At the beginning of each players upkeep, that
player may choose to lose 2 life and then create a colorless artifact token named Gold. It has "Sacrifice this artifact: Add one mana of any
color."
Creatures your opponent controls can't attack
you unless their controller pays {x} for each
creature they control that's attacking you. X is
the number of artifacts named Gold in play.
"Their greed leads only to my success."