Vial Smasher the Fierce
Legendary Creature - Goblin Berserker | Power/Toughness: 2 / 3 (CMC 3)
Whenever you cast your first spell each turn, choose an opponent at random. Vial Smasher the Fierce deals damage equal to that spell's mana value to that player or a planeswalker that player controls.
Partner (You can have two commanders if both have partner.)