Revenant Jarls Vanga and Ulmr

When Revenant Jarls Vanga and Ulmr enters the battlefield, choose Vanga or Ulmr.
•Vanga —At the beginning of combat on your turn, create a 3/1 black Skeleton creature token with haste, deathtouch, lifelink, and menace.
•Ulmr —Cards in your graveyard can't be exiled.
{2}{b}{g}: Sacrifice Vanga and Ulmr. Return it to the battlefield at the beginning of your next upkeep.