Teferi's Moat + Sandwurm Convergence + Darkest Hour

Teferi's Moat

Sandwurm Convergence

Darkest Hour

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 Darkest Hour), no creatures can attack you.