mtg anthologies card list Arena Anthology 3 (s:AA3) cards are in the client and craftable. Seem to also be legal in decks. Went in with the update today. : r/MagicArena

YOUR NEW FOREVER FAVORITESIntroducing a heaping helping of exciting cards for Modern, one of Magics most celebrated formats, plus the return of competitive favorites, theres something for everyone to love in Modern Horizons 3 POWERFUL CARDS FOR MODERN CONSTRUCTED, LIMITED & COMMANDER PLAYSpice up your deck with powerful New-to-Modern cards, host a supercharged Booster Draft with friends, or discover Legendary Creatures with striking special treatments to inspire your next Commander Deck MODERNS NEVER BEEN MORE MARVELOUSExpand your horizons with novel twists on classic mechanics and more cards for beloved Modern strategies FUN TO OPEN

Summary In summary, the process of making custom Magic: The Gathering cards is truly enchanting

There's a setup for every collector.

With a full display, players can explore a varied amount of breathtaking card treatments and build on their existing deck strategies