Azvolai

“When this attacks” is a triggered effect that triggers when the dragon is considered to have attacked, during the attack step. It does not trigger if the combat chain closes in the layer step of combat. After it triggers, it will still resolve even if the dragon ceases to exist or the combat chain closes.

A single target cannot be chosen more than once for one instances of the term “target”. You can select the target of the attack as one of the targets for this effect.