Curse of Shaken Faith — ruling 1

If a player who has already cast a spell this turn becomes enchanted by Curse of Shaken Faith, casting more spells the same turn will cause the ability to trigger.

Curse of Shaken Faith : règles, fonctionnement et interactions (MTG)

Curse of Shaken Faith 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

Enchant player Whenever enchanted player casts a spell other than the first spell they cast each turn or copies a spell, this Aura deals 2 damage to them.

How it works : Curse of Shaken Faith

Original English text — Wizards of the Coast / Scryfall

#1September 24, 2021· Wizards of the Coast
If a player who has already cast a spell this turn becomes enchanted by Curse of Shaken Faith, casting more spells the same turn will cause the ability to trigger.
No other card is named in this ruling.