Stormcatch Mentor

• WOTC Official Reminder Textofficial rules
  Prowess — Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.

• WWizards of the Coast2024-07-26
  Official Ruling
  To determine the total cost of a spell, start with the mana cost or alternative cost you're paying (such as a flashback cost), add any cost increases (such as kicker costs), then apply any cost reductions (such as that of this ability). The mana value of the spell is determined by only its mana cost, no matter what the total cost to cast that spell was.
• WWizards of the Coast2024-07-26
  Official Ruling
  The cost reduction applies only to generic mana in the total cost of instant and sorcery spells you cast.

Rulings via Scryfall