Shadow in the Warp
Enchantment
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.
The astropath collapsed, his empty eye sockets aglow. He spoke three words before falling lifeless to the ground: "They . . . are . . . coming!"
Kim Sokol
Warhammer 40,000 Commander (40K)
• #140★Rulings
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.
(wotc • 2022-10-07)
Rulings
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.
(wotc • 2022-10-07)