Teferi's Moat + Sandwurm Convergence + Painter's Servant

Teferi's Moat

Sandwurm Convergence

Painter's Servant

How it works

1. Because Sandwurm Convergence prevents creatures with flying from attacking you, and Teferi's Moat prevents creatures without flying from attacking you (as they're all the named color due to Painter's Servant), no creatures can attack you.