You don't lose the game for having 0 or less life.When you have 20 or more life, you lose the game.Whenever you lose life, you gain 2 life for each 1 life you lost. (Damage dealt to you causes you to lose life.)
FlyingThreshold — As long as seven or more cards are in your graveyard, Boneshard Slasher gets +2/+2 and has "When Boneshard Slasher becomes the target of a spell or ability, sacrifice it."
Whenever Grotesque Hybrid deals combat damage to a creature, destroy that creature. It can't be regenerated.Discard a card: Grotesque Hybrid gains flying and protection from green and from white until end of turn.
FlyingThreshold — As long as seven or more cards are in your graveyard, Gloomdrifter has "When Gloomdrifter enters, nonblack creatures get -2/-2 until end of turn."
Whenever Carrion Rats attacks or blocks, any player may exile a card from their graveyard. If a player does, Carrion Rats assigns no combat damage this turn.
Psychotic Haze deals 1 damage to each creature and each player.Madness (If you discard this card, discard it into exile. When you do, cast it for its madness cost or put it into your graveyard.)
Whenever Cephalid Illusionist becomes the target of a spell or ability, mill three cards., : Prevent all combat damage that would be dealt to and dealt by target creature you control this turn.
Swampwalk (This creature can't be blocked as long as defending player controls a Swamp.)When Slithery Stalker enters, exile target green or white creature an opponent controls.When Slithery Stalker leaves the battlefield, return the exiled card to the battlefield under its owner's control.
At the beginning of your upkeep, you lose 1 life.At the beginning of your upkeep, you may return target creature card from your graveyard to the battlefield. That creature gains haste until end of turn. Exile it at the beginning of the next end step.
Target creature gets -2/-2 until end of turn.Flashback—, Pay 3 life. (You may cast this card from your graveyard for its flashback cost. Then exile it.)
Discard a card: Putrid Imp gains flying until end of turn.Threshold — As long as seven or more cards are in your graveyard, Putrid Imp gets +1/+1 and can't block.
Protection from blackAt the beginning of your upkeep, sacrifice Anurid Scavenger unless you put a card from your graveyard on the bottom of your library.
, Discard a card: Prevent the next 3 damage that would be dealt to any target this turn., Sacrifice Hypochondria: Prevent the next 3 damage that would be dealt to any target this turn.