Monastery Mentor

Prowess goes on the stack on top of the spell that caused it to trigger. It will resolve before that spell.

Prowess triggers only once for any spell, even if that spell has multiple types.

Casting a noncreature spell will cause both prowess and Monastery Mentor's other ability to trigger. You can put these abilities on the stack in either order. Whichever ability is put on the stack last will resolve first.