27 Apr 2018
If you’re dealt more damage than you have cards to exile, you’ll just exile everything you can.
27 Apr 2018
While you can’t lose the game, your opponents can still win the game if an effect says so.
27 Apr 2018
You don’t have to exile all the cards from one place. For example, if a source deals 5 damage to you, you may exile one permanent, two cards from hand, and two cards from your graveyard.
27 Apr 2018
If you run out of other permanents, cards in hand, and cards in graveyard, you’ll have to exile Lich’s Mastery itself and lose the game.
27 Apr 2018
While you control Lich’s Mastery, your life total still changes. Lich’s Mastery’s effects don’t replace the life gain or life loss.