Electro, Assaulting Battery

Legendary Creature — Human Villain

{1}{R}{R}

Flying You don't lose unspent red mana as steps and phases end. Whenever you cast an instant or sorcery spell, add {R}. When Electro leaves the battlefield, you may pay {X}. When you do, he deals X damage to target player.

2/3

Rulings and every printing on Scryfall