Mordekaiser, the Iron Revenant

Allegiance - Shadow Isles (You may cast Mordekaiser, the Iron Revenant from your graveyard
if you control at least one creature with Allegiance -
Shadow Isles.)
{b}{b}, {t}: Exile target creature and Mordekaiser,
the Iron Revenant. Return those cards to the battlefield under their owner's control at the beginning of the next end step. They enter the battlefield with a -1/-1 counter on them.