It's similar to Xmage, but with heavy leaning into PVE. There are around a dozen original modes to play against AI opponents: Adventure (à la Shandalar 1997),

It's similar to Xmage, but with heavy leaning into PVE. There are around a dozen original modes to play against AI opponents: Adventure (à la Shandalar 1997), Quest, Planar Conquest, Gauntlet, Puzzles. Plus practically every somewhat popular format, including digital-only: Momir from Shandalar, Drafts, Sealed, Cube, Commander, Oathbreaker, Brawl, Archenemy, etc. etc. There's a way to setup online multiplayer games, but no hubs or rooms like in Xmage. It's also somewhat under-utilised feature and therefore not so well supported. I haven't actually tried cockatrice, but I believe it's more like a tabletop simulator, e.g. you have to shuffle, draw, and play the game almost manually? Forge is completely automatic like Xmage, Shandalar and Magic Online. It also could be a fun way to learn the rules of the game.