Vect, Lord of Commorragh

Flash
Supreme Overlord-This card must be your commander.
{u}{b}{r}: As an additional cost pay XX life where X is the number of times your commander has left the battlefield. Place this card on the battlefield from your command zone.
Agents of Vect-When this card enters the battlefield you may do one of the following:
•Counter target spell.
•Deal 3 damage to any target.