"I have calculated that a dragon in flight, in a single strafing run, can cover an area of—"
—Thaedus the Clever, last words

Flame Sweep

Flame Sweep deals 2 damage to each creature except for creatures you control with flying.

Core Set 2020 Promos

Core Set 2020

The only creatures that avoid Flame Sweep’s damage are those you control with flying. The set of creatures dealt damage includes creatures you don’t control with flying and creatures you control without flying.