Claws Out

• WOTC Official Reminder Textofficial rules
  Affinity — This spell costs less to cast for each [quality] you control.

• WWizards of the Coast2024-11-08
  Official Ruling
  To determine the total cost of a spell, start with the mana cost or alternative cost you're paying, add any cost increases, then apply any cost reductions. The mana value of the spell remains unchanged, no matter what the total cost to cast it was.

Rulings via Scryfall