Blitzcrank, Great Steam Golem

Powered (This creature gets +1/+1 for every third
energy counter.)
When Blitzcrank, Great Steam Golem enters the battlefield, you get {e}{e}{e}{e}.
Pay {e}{e}: Tap target creature. You gain control
of that creature, return it at the beginning of
your next upkeep. You may activate this ability
once every other turn.