Duskmourn's Domination

In Commander, Duskmourn's Domination earns its slot in theft-focused or Grixis-style value decks — stealing an opponent's Eldrazi or game-winning creature for a combat step, then watching that creature die in the red zone, is a clean two-for-one. At five mana it competes with Claim the Firstborn and Act of Treason effects that cost two or three, but the lack of a power restriction makes it scale into the late game where those cheaper spells often can't target the threat that matters. In 60-card formats like Modern and Pioneer, five mana for a one-turn steal is too slow without a guaranteed sacrifice outlet to make it permanent, so it rarely makes the cut. Standard is its best non-Commander home if the format has large, punishing creatures worth borrowing for a single combat.