Rising of the Flames

Dragons you control have haste and "{r}: This creature gets +1/0 until the end of turn.

At the beginning of each of your endsteps, if a dragon did not enter the battlefield under your control this turn, sacrifice Rising of the Flames.

At first the soldiers thought daybreak had come.
Then they smelled sulfur on the wind and realized it was not the sun, but a wave of dragonfire imitating a false dawn.