Bjorna, Nightfall Alchemist / Wernog, Rider's Chaplain

How it plays & wins

This is a fast, blue-black-red-white turbo deck built around free mana, cheap tutors and a thick stack of free interaction. Moxen, Lotus Petal, Dark Ritual, Mana Vault and Ancient Tomb power out early plays. Vampiric Tutor, Demonic Tutor, Mystical Tutor, Enlightened Tutor and Gamble find the pieces. Force of Will, Fierce Guardianship, Force of Negation, Pact of Negation and Swan Song protect the win, while Rhystic Study, Mystic Remora and Smothering Tithe give value if the game slows down.

The most likely win is a single-turn combo. Demonic Consultation or Tainted Pact into Thassa's Oracle empties the library and wins on the spot. The other line is Underworld Breach with Lion's Eye Diamond or Brain Freeze, where you cast spells from the graveyard until Brain Freeze finishes the job. How the commanders fit in isn't clear to me from the list alone.

Analysis written with AI assistance based on this decklist.