
You don't lose the game for having 0 or less life.
Whenever you lose life, sacrifice a permanent for each 1 life you lost. (Damage causes loss of life.)
Lich's Tomb has 1 printing, first in Darksteel (2004). EDHREC ranks it #15,618 among Commander cards. It appears most in Stiltzkin, Moogle Merchant decks (944 on EDHREC).
Deck counts from EDHREC.
Cards that show up in the same decks on EDHREC.