Banned Card List
Cards banned in Vintage are not legal in Oathbreaker: notably, the 25 cards with the “Conspiracy” card type, silver bordered cards, skill testing cards such as falling star, and the 9 cards that reference “playing for ante” are not legal.
Additionally, the following 44 cards are banned in Oathbreaker (last updated 4/4/19- High Tide banned):
Ad Nauseam
Ancestral Recall
Balance
Biorhythm
Black Lotus
Channel
Doomsday
Emrakul, the Aeons Torn
Expropriate
Fastbond
Gifts Ungiven
Griselbrand
High Tide
Library of Alexandria
Limited Resources
Lion’s Eye Diamond
Mana Crypt
Mana Geyser
Mana Vault
Mox Emerald
Mox Jet
Mox Pearl
Mox Ruby
Mox Sapphire
Natural Order
Painter's Servant
Panoptic Mirror
Primal Surge
Primeval Titan
Recurring Nightmare
Saheeli, the Gifted
Sol Ring
Sundering Titan
Sway of the Stars
Sylvan Primordial
Time Vault
Time Walk
Tinker
Tolarian Academy
Tooth and Nail
Trade Secrets
Upheaval
Worldfire
Yawgmoth's Bargain