Strixhaven: School of Mages

Strixhaven Stadium | Artifact | | {T}: Add {C}. Put a point counter on Strixhaven Stadium. Whenever a creature deals combat damage to you, remove a point counter from Strixhaven Stadium. Whenever a creature you control deals combat damage to an opponent, put a point counter on Strixhaven Stadium. Then if it has ten or more point counters on it, remove them all and that player loses the game. | Piotr Dura

Reflective Golem | Artifact Creature | Golem | Whenever you cast an instant or sorcery spell that targets only Reflective Golem, you may pay {2}. If you do, copy that spell. You may choose new targets for the copy. | Daniel Ljunggren

Codie, Vociferous Codex | Legendary Artifact Creature | Construct | You can't cast permanent spells. {4}, {T}: Add {W}{U}{B}{R}{G}. When you cast your next spell this turn, exile cards from the top of your library until you exile an instant or sorcery card with lesser mana value. Until end of turn, you may cast that card without paying its mana cost. Put each other card exiled this way on the bottom of your library in a random order. | Daniel Ljunggren

Letter of Acceptance | Artifact | | {T}: Add one mana of any color. {2}, {T}, Sacrifice Letter of Acceptance: Draw a card. | Daniel Ljunggren

Expanded Anatomy | Sorcery | Lesson | Put two +1/+1 counters on target creature. It gains vigilance until end of turn. | Slawomir Maniak

Introduction to Prophecy | Sorcery | Lesson | Scry 2, then draw a card. | Micah Epstein