Selfish Leprechaun

You may cast Selfish Leprechaun without paying
it's mana cost if you sacrifice a permanent of all
colors or an artifact or land that produces any
color mana. When Selfish Leprechaun enters
the battlefield, all nonland permanents gain
all colors for as long as it remains on the
battlefield. At the beginning of your upkeep,
each player sacrifices a nonland permanent
of all colors. When it dies, create a Gold token,
then return him from your graveyard to your
hand.