Lucky the Leprechaun

You may sacrifice 1 treasure token rather than
pay this spell's mana cost.
Lucky the Leprechaun can't be blocked.
Whenever Lucky the Leprachaun becomes the
target of a spell or ability, return Lucky the
Leprachaun to it's owner's hand and create a
colorless Treasure artifact token with "{t},
Sacrifice this artifact: Add one mana of any
color."