Mischievous Chimera

• WOTC Official Reminder Textofficial rules
  Scry — Look at the top N cards of your library, then put any number of them on the bottom of your library and the rest on top in any order.

• WWizards of the Coast2020-01-24
  Official Ruling
  An ability that triggers when you cast a spell resolves before the spell that caused it to trigger. It resolves even if that spell is countered.
• WWizards of the Coast2020-01-24
  Official Ruling
  You scry 1 just once, no matter how many opponents are dealt damage.
• WWizards of the Coast2020-01-24
  Official Ruling
  This ability triggers only on your very first spell during an opponent’s turn, not the first spell after the card is on the battlefield. If you cast a spell before it’s on the battlefield (including if you cast this card somehow during an opponent’s turn), the ability won’t trigger.
• WWizards of the Coast2020-01-24
  Official Ruling
  In a Two-Headed Giant game, this ability triggers no more than once during each opposing team’s turn.
• WWizards of the Coast2020-01-24
  Official Ruling
  In a Two-Headed Giant game, each opposing team loses 2 life and you scry 1.
• WWizards of the Coast2020-01-24
  Official Ruling
  If you have more than one opponent, this ability can trigger once during each of those opponents’ turns.

Rulings via Scryfall