Mir'Sul, Prince of Capenna

Menace, Shroud

Instant, Sorcery, and Demon creature spells you cast cost
{1} less to cast

Creatures your opponent's control get -X/-X where X is equal to the number of Demons in your graveyard

Demon creatures you control enter the battlefield with your choice of either Menace, Shroud or Haste. you may pay additional {1} to choose additional abilities when they enter the battlefield