Itzquinth, Firstborn of Gishath — ruling 1

You don't choose targets for Itzquinth, Firstborn of Gishath's triggered ability at the time it triggers. Rather, a second "reflexive" ability triggers when you pay {2} this way. You choose targets for that ability as it goes on the stack. Each player may respond to this triggered ability as normal.

Itzquinth, Firstborn of Gishath : règles, fonctionnement et interactions (MTG)

Itzquinth, Firstborn of Gishath 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

Haste When Itzquinth enters, you may pay . When you do, target Dinosaur you control deals damage equal to its power to another target creature.

How it works : Itzquinth, Firstborn of Gishath

Original English text — Wizards of the Coast / Scryfall

#1November 10, 2023· Wizards of the Coast
You don't choose targets for Itzquinth, Firstborn of Gishath's triggered ability at the time it triggers. Rather, a second "reflexive" ability triggers when you pay this way. You choose targets for that ability as it goes on the stack. Each player may respond to this triggered ability as normal.
No other card is named in this ruling.