Berserkion the Electromagna

Magnetism, Haste, Vigilance, Firststrike

Whenever you cast Berserkion, you may sacrifice up to three creatures. If you do, reduce the generic mana cost to cast this spell equal to the number of creatures sacrificed.

Whenever Berserkion attacks, you may target
a creature an opponent controls. If you do, pay {e} equal to that creature mana value and exile that creature.