Dracula, Belmont's Bane

Whenever you cast your first spell each turn, choose
an opponent at random. Dracula, Belmont's Bane 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.)
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"What is a man? A miserable little pile of secrets!
But enough talk... have at you!"
— Dracula