Quistis Trepe — ruling 1

You choose whether to cast the target instant or sorcery card as Quistis Trepe's triggered ability resolves. If you do, you do so as part of the resolution of that ability. You can't wait to cast it later in the turn. Timing restrictions based on the card's types are ignored.

Quistis Trepe : règles, fonctionnement et interactions (MTG)

Quistis Trepe is one of those cards players keep asking about. Here is, in plain words, what its official text says, the rulings published by Wizards of the Coast, and the combos players actually run.

Official card text

Blue Magic — When Quistis Trepe enters, you may cast target instant or sorcery card from a graveyard, and mana of any type can be spent to cast that spell. If that spell would be put into a graveyard, exile it instead.

How it works : Quistis Trepe

Original English text — Wizards of the Coast / Scryfall

#1June 6, 2025· Wizards of the Coast
You choose whether to cast the target instant or sorcery card as Quistis Trepe's triggered ability resolves. If you do, you do so as part of the resolution of that ability. You can't wait to cast it later in the turn. Timing restrictions based on the card's types are ignored.
No other card is named in this ruling.