Mindslaver + Lethal Vapors + Leyline of Anticipation

Mindslaver

Lethal Vapors

Leyline of Anticipation

How it works

1. Activate Mindslaver by paying 4, tapping and sacrificing it, causing you to gain control of target opponent during their next turn.
2. During the opponent's turn, cast Lethal Vapors by paying 2.
3. As the opponent, activate Lethal Vapors by paying 0 an arbitrarily large number of times, causing that opponent to skip that many turns.

By seizing control of your opponent's mind with Mindslaver, you gain the agency needed to turn their own resources against them. With Leyline of Anticipation allowing you to cast spells as though they had flash, you can drop Lethal Vapors right into play during that controlled turn. Finally, because Lethal Vapors features an activation cost of {0} with no restriction on who can use it, your puppeted opponent can repeatedly sacrifice their turns, locking them out of the game entirely.