Kitsa, Otterball Elite

• WOTC Official Reminder Textofficial rules
  Prowess — Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.
• WOTC Official Reminder Textofficial rules
  Vigilance — Attacking doesn't cause this creature to tap.

• WWizards of the Coast2024-07-26
  Official Ruling
  If the spell that’s copied has an X whose value was determined as it was cast, the copy will have the same value of X.
• WWizards of the Coast2024-07-26
  Official Ruling
  If the spell has damage divided as it was cast, the division can’t be changed (although the targets receiving that damage still can). The same is true of spells that distribute counters.
• WWizards of the Coast2024-07-26
  Official Ruling
  The copy will have the same targets as the spell it’s copying unless you choose new ones. You may change any number of the targets, including all of them or none of them. If, for one of the targets, you can’t choose a new legal target, then it remains unchanged (even if the current target is illegal).
• WWizards of the Coast2024-07-26
  Official Ruling
  If the spell that’s copied is modal (that is, it says “Choose one —” or the like), the copy will have the same mode. A different mode can’t be chosen.
• WWizards of the Coast2024-07-26
  Official Ruling
  The copy created by Kitsa’s last ability is created on the stack, so it’s not “cast.” Abilities that trigger when a player casts a spell won’t trigger.
• WWizards of the Coast2024-07-26
  Official Ruling
  Once you’ve activated Kitsa’s last ability, any changes to Kitsa’s power won’t stop the ability from resolving.
• WWizards of the Coast2024-07-26
  Official Ruling
  The controller of a copy can’t choose to pay any alternative or additional costs for the copy. However, effects based on any alternative or additional costs that were paid for the original spell are copied as though those same costs were paid for the copy.
• WWizards of the Coast2024-07-26
  Official Ruling
  If you copy a spell, you control the copy. It will resolve before the original spell does.

Rulings via Scryfall