MH3 brings back modal dual-faced cards which smooth Magics most nettlesome problem: a system that requires decks to balance lands, the resources that pay for creatures and spells, which actually progress the game
Fold it in half the short way, and you get a rectangle roughly 3.07 inches tall and 2.61 inches wide
The biggest reason for this change seems to be that the sorcery has been widely adopted in Legacy Miracles decks where it combos with both Narset, Parter of Veils (to Mind Twist away your opponent's while refilling your hand) and Teferi, Time Raveler, which allows you to cast Day's Undoing on your opponent's end step to get around the "end your turn" drawback
This means that the cards color identities also need to be the same as your commander's
The game has three boards and plays more or less like a mix of Hearthstone and Legends
Enhanced Booster Box allocation is 2-3 per customer at launch