Teferi's Moat + Painter's Servant + Archetype of Imagination

Teferi's Moat

Painter's Servant

Archetype of Imagination

How it works

1. Teferi's Moat prevents creatures of the chosen color without flying from attacking you.
2. Because Painter's Servant makes all creatures the chosen color, and Archetype of Imaginaton causes all creatures your opponents control to lose flying, no creatures can attack you.