Altanian Dragon War

As Altanian Dragon War enters the battlefield,
choose Warlords or Dragons.
Warlords-At the beginning of your upkeep, you
may destroy target creature with flying. If that creature is a dragon, gain life equal to its power.
Dragons-At the beginning of your upkeep,
Altanian Dragon War deals 3 damage to each
creature without flying. Then, create a 3/3
Red and Black Dragon creature token with flying.