Vial Smasher the Fierce
From Duskmourn: House of Horror Commander set
Vial Smasher the Fierce
Legendary Creature — Goblin Berserker
2/3
Whenever you cast your first spell each turn, choose an opponent at random. Vial Smasher 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.)