Enchantment
When a source an opponent controls deals damage to you, sacrifice this enchantment. If you do, create a 5/5 red Dragon creature token with flying.
Awaken the Sky Tyrant will trigger once for each source an opponent controls that deals damage to you, but you can sacrifice it only once.
If Awaken the Sky Tyrant isn’t on the battlefield as its ability resolves, you can’t sacrifice it. You won’t get the Dragon in that case.