Prowess goes on the stack on top of the spell that caused it to trigger. It will resolve before that spell.
Once it triggers, prowess isnâ€™t connected to the spell that caused it to trigger. If that spell is countered, prowess will still resolve.
Any spell you cast that doesnâ€™t have the type creature will cause prowess to trigger. If a spell has multiple types, and one of those types is creature (such as an artifact creature), casting it wonâ€™t cause prowess to trigger. Playing a land also wonâ€™t cause prowess to trigger.
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