Chomper

If you would pay life for this spell or it's abilities,
you pay three times that life instead.
Chomper is in your command zone hidden.
(Do not reveal him to your opponents.)
Infect
{p/g}: Chomper gets +3/+3 until end of turn.
{p/u}: Exile Chomper, then return it to its owner's control at the beginning of the next end step.
{p/w}: Target creature can't block Chomper this
turn.