Just another one. Cockatrice still better if you wanna proxy locally w friends imo though im p noob still so i like the rule enforcement when dealing w new cards. It enforces rules like mtgo, makes it way better playing randoms online than the others and uses the same kinds of shortcuts as mtgo, w new sets there's usually a few bugs but i haven't encountered any errors so far.
They support all types of magic play afaik. Cube, Sealed, Draft, Pauper, Commander, Constructed etc. Good way to get practice in without breaking the bank, then take yourself to mtgo and get some QPs.