The Magic: the Gathering strategy of having only one creature that can kill opponents out of nowhere exists in the Standard metagame. The deck archetype is Mono-White Magecraft. The term as introduced from the Strixhaven set is a stronger version of Prowess and it also benefits from each copy version of the spell.

Unfortunately, this archetype didn’t have the need to use cards from the Adventures in the Forgotten Realms set maybe because of maintaining the consistency though a few card tech won’t hurt. That is per my personal touch as I might consider some one-of essentials to be part of the list. Anyhow, here below is the version of the Mono-White Magecraft Deck for MTG Arena Standard BO1.

18 Plains

4 Defiant Strike
4 Fight as One
4 Light of Hope
4 Speaker of the Heavens
4 Sejiri Shelter
4 Clarion Spirit
4 Clever Lumimancer
4 Guiding Voice
4 Leonin Lightscribe
4 Mavinda, Students’ Advocate
2 Show of Confidence

Sideboard
1 Environmental Sciences
2 Expanded Anatomy
1 Mascot Exhibition
1 Academic Probation
1 Reduce to Memory
1 Inkling Summoning

Reference: https://mtga.untapped.gg/meta/archetypes/1217/mono-white-magecraft