Because Sandwurm Convergence prevents creatures with flying from attacking you, and Magus of the Moat prevents creatures without flying from attacking you, no creatures can attack you.

You can't be attacked

Lock

Magus of the Moat

Sandwurm Convergence

Because Sandwurm Convergence prevents creatures with flying from attacking you, and Form of the Dragon prevents creatures without flying from attacking you, no creatures can attack you.

Form of the Dragon

Because Sandwurm Convergence prevents creatures with flying from attacking you, and Moat prevents creatures without flying from attacking you, no creatures can attack you.

Moat

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.

Teferi's Moat

Painter's Servant

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.

Combos with "Sandwurm Convergence"