Magic: The Gathering Battlegrounds Cheats

Magic: The Gathering Battlegrounds Cheat: Hidden Level
At arena select screen press L + R, Left, Up, X, Up, Right, Y, L + R

Magic: The Gathering Battlegrounds Cheat: All Duelists
At character select screen press L + R, DOWN, UP, X, WHITE, UP, X, BLACK, UP, X, L + R

Magic: The Gathering Battlegrounds Unlock Mishra
To unlock Mishra, beat Quest Mode using a preset duelist and deck.

Magic: The Gathering Battlegrounds Unlock Other Duellists
Play arcade mode and beat it as each of the duelists; each time you win, you unlock the next highest duelist of that color. For example, win as Kuldan unlock Volita, then win as Volita to unlock Maraxus and win as Maraxus to be able to play Maraxus.