Seiger Salazhir, Necromant

Morbid - Whenever you cast Seiger Salazhir, Necromant, if a creature died this turn, you
may pay {x}{w}. If you do, create X 1/1 white Spirit creature tokens with flying.
{x}{u}{b}, Sacrifice a Spirit: Gain control of target creature with converted mana cost X for as long
as you control Seiger Salazhir, Necromant.
"My life is devoted to the confluence of host and spirit, the melding of life and death."