Shuri, Wakandan Inventor + Mindslaver + Mechanized Production

Shuri, Wakandan Inventor

Mindslaver

Mechanized Production

How it works

1. At the beginning of your upkeep, Mechanized Production triggers, creating an artifact token.
2. Activate Shuri by paying 1 and tapping it, causing the artifact token to become a copy of Mindslaver that isn't legendary.
3. Activate the artifact token by paying 4, tapping and sacrificing it, causing you to gain control of target opponent during their next turn.
4. Repeat during each of your turns.