Lightning Surge

You may cast Lightning Surge without paying its mana cost if three or more spells have been cast this turn.
Choose one: Counter target spell with converted mana cost 3 or less; or Lightning Surge deals 3 damage to target creature or player; or cast target instant or sorcery card with converted mana cost 1 or less from your graveyard without paying its mana cost, then exile it as it resolves.