Shadow in the Warp — ruling 1

Both the first and last abilities of Shadow in the Warp take into account spells cast before it was on the battlefield. For example, if an opponent cast a noncreature spell before it was on the battlefield, then casts a noncreature spell after it is put on the battlefield, Shadow in the Warp's second ability won't trigger because that is the second noncreature spell they've cast that turn.

Shadow in the Warp : règles, fonctionnement et interactions (MTG)

Shadow in the Warp 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

The first creature spell you cast each turn costs less to cast. Whenever an opponent casts their first noncreature spell each turn, this enchantment deals 2 damage to that player.

How it works : Shadow in the Warp

Original English text — Wizards of the Coast / Scryfall

#1October 7, 2022· Wizards of the Coast
Both the first and last abilities of Shadow in the Warp take into account spells cast before it was on the battlefield. For example, if an opponent cast a noncreature spell before it was on the battlefield, then casts a noncreature spell after it is put on the battlefield, Shadow in the Warp's second ability won't trigger because that is the second noncreature spell they've cast that turn.
No other card is named in this ruling.