When Asha left Bant, she ensured that the world would have protection and order in her absence.

Sigil of the Empty Throne

Whenever you cast an enchantment spell, create a 4/4 white Angel creature token with flying.

Duskmourn: House of Horror Commander

Commander Masters

Jumpstart 2022

Time Spiral Remastered

Historic Anthology 2

An ability that triggers when a player casts a spell resolves before the spell that caused it to trigger, but after targets have been chosen for that spell. It resolves even if that spell is countered.

Because it's not on the battlefield yet, casting Sigil of the Empty Throne won't cause its own ability to trigger.