Raiden Ei, Electro Archon

Whenever another creature enters the battlefield
under your control, you gain life equal to that creature's toughness.
{1}{w}{u},{t}: Populate (Create a token that's a copy
of a creature token you control.)
"This body is the noblest and most eminent of all in
this world. It should hold absolute control over this
world. It once promised its people a dream: the never changing ""eternity."—Beelzebul