Cantankerous and territorial, sandwurms claim even the skies above their dunes.

Sandwurm Convergence

Creatures with flying can't attack you or planeswalkers you control.
At the beginning of your end step, create a 5/5 green Wurm creature token.

Duskmourn: House of Horror Commander

Commander Masters

Commander Legends: Battle for Baldur's Gate

New Capenna Commander

Amonkhet Remastered

Once a creature has attacked you or a planeswalker you control, it will remain in combat even if it gains flying. Similarly, if a creature with flying enters the battlefield attacking, Sandwurm Convergence's first ability can't undo that attack.