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.

Creatures cannot attack you

Form of the Dragon

Sandwurm Convergence

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 Magus of the Moat prevents creatures without flying from attacking you, no creatures can attack you.

Combos with "Sandwurm Convergence"