Unruly Catapult

• WOTC Official Reminder Textofficial rules
  Defender — This creature can't attack.

• WWizards of the Coast2023-09-01
  Official Ruling
  Unruly Catapult's triggered ability resolves before the spell that caused it to trigger. It resolves even if that spell is countered.
• WWizards of the Coast2023-09-01
  Official Ruling
  In a Two-Headed Giant game, Unruly Catapult's activated ability causes the opposing team to lose 2 life.
• WWizards of the Coast2023-09-01
  Official Ruling
  Players can cast spells and activate abilities (such as Unruly Catapult's own activated ability) after the triggered ability resolves but before the spell that caused it to trigger does.

Rulings via Scryfall