Flying

Whenever a creature dealt damage by Baron Sengir this turn dies, put a +2/+2 counter on Baron Sengir.

: Regenerate another target Vampire.

Flying

Whenever a creature an opponent controls is dealt damage, put a +1/+1 counter on Kazarov, Sengir Pureblood.

: Kazarov deals 2 damage to target creature.

Flying

Whenever one or more other creatures die, put a +1/+1 counter on Sengir Connoisseur. This ability triggers only once each turn.

Flying

Whenever another creature dies, put two +1/+1 counters on Sengir, the Dark Baron.

Whenever another player loses the game, you gain life equal to that player's life total as the turn began.

Partner (You can have two commanders if both have partner.)