Mystic Sanctuary + Dust Bowl + Capture of Jingzhou + Crucible of Worlds

Mystic Sanctuary

Dust Bowl

Capture of Jingzhou

Crucible of Worlds

How it works

1. Cast Capture of Jingzhou by paying its mana cost, causing you to take an extra turn after this one.
2. Activate Dust Bowl by paying 3, tapping it and sacrificing Mystic Sanctuary, destroying a nonbasic land.
3. Play Mystic Sanctuary from your graveyard.
4. When Mystic Sanctuary enters untapped, it triggers, putting Capture of Jingzhou from your graveyard onto the top of your library.
5. Move to your next turn, drawing Capture of Jingzhou during your draw step.
6. Repeat.

This brilliant loop gives you near-infinite turns by constantly recycling the exact same extra turn spell. You kick things off by casting Capture of Jingzhou, then use Dust Bowl to sacrifice Mystic Sanctuary, which cleverly sidesteps the land's entry restrictions by putting it directly into the graveyard. From there, Crucible of Worlds lets you seamlessly replay Mystic Sanctuary from your graveyard, triggering its ability to place Capture of Jingzhou right back on top of your library to draw and cast again.