Below is a list of the unlockable Personas, along with details of how to get them:
Mulligan down to one card and then win the game.
Attack an opponent with a copy of a creature.
Counter a spell that's targeting a spell you control.
Exile a creature.
Deal 10 damage that's not combat damage to a player in a turn.
Cast five spells in a single turn.
Gain 20 life during combat in a single duel.
Have twenty or more lands on the battlefield.
Deal 10 combat damage to a player with flying creatures in a single turn.
Win during an opponent's combat phase.
Play an online match between midnight and 1:00 a.m. Local console time.
Win a duel while at 1 life.
Have a life total of 100 or higher.
Added by: MongooseGeneral Jul 7th 2013, ID#9268