Vial Smasher the Fierce is a mythic Legendary Creature — Goblin Berserker card from Magic Online Promos (PRM), collector number 86182.
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.)