Spells you cast cost 3 less to cast if they were originally printed in the following expansions or associated commander decks, depending on who won the Unknown event on February 18th, 2023:

Mirran Victory — Mirrodin, Darksteel, Fifth Dawn, and Scars of Mirrodin.

Phyrexian Victory — Mirrodin Besieged, New Phyrexia, All Will be One, and March of the Machine.