Emergency Battery

Whenever Emergency Battery enters the battlefield, you may exile an artifact creature you control until Emergency Battery leaves the battlefield. If you do not, sacrifice Emergency
Battery.
At the beginning of your upkeep, gain a number
of {e} equal to the exiled card's mana value.
Sacrifice Emergency Battery: Target creature
gets +1/+1 and snow landwalk until the end of
the turn.
"...I just needed a little more time."