Mischievous Chimera

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.

You scry 1 just once, no matter how many opponents are dealt damage.

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.