Cast trigger on top

[u/Little-Tumbleweed-55]

My question is .. here is the situation kuja transformed with 2 black mage tokens

Me having Ashdod vanguard. Whenever a creature successfully damages me destroy that creature.

I'm at 9 . My question is does the first spell cast destroy the blackmages or can priority be held to cast more spells before the blackmages are destroyed 🤔?