Toph, the First Metalbender + Mindslaver

Toph, the First Metalbender

Mindslaver

How it works

1. At the beginning of your end step, Toph triggers, causing Mindslaver to become an artifact land creature.
2. Activate Mindslaver by paying 4, tapping and sacrificing it.
3. Toph triggers, returning Mindslaver from your graveyard to the battlefield.
4. Resolve the Mindslaver ability, causing you to gain control of an opponent during their next turn.
5. Repeat during each of your turns.

This loop turns Toph, the First Metalbender and Mindslaver into an inescapable, game-ending lock. Because Toph's static ability makes your nontoken artifacts into lands, Mindslaver is treated as a land—meaning when Toph's end step trigger earthbends it into a creature, its death and exile trigger appropriately returns it straight to the battlefield tapped instead of leaving it in the graveyard. This lets you sacrifice Mindslaver for four mana to steal an opponent's turn, only for Toph to bring it right back on your next end step ready to be used again.