Rite of Flame

Add {R}{R}, then add {R} for each card named Rite of Flame in each graveyard.

Death's Shadow

Death's Shadow gets -X/-X, where X is your life total.

Slaughter Pact

Destroy target nonblack creature.
At the beginning of your next upkeep, pay {2}{B}. If you don't, you lose the game.

Pact of Negation

Counter target spell.
At the beginning of your next upkeep, pay {3}{U}{U}. If you don't, you lose the game.

Warrior's Oath

Take an extra turn after this one. At the beginning of that turn's end step, you lose the game.

Apostle's Blessing

({W/P} can be paid with either {W} or 2 life.)
Target artifact or creature you control gains protection from artifacts or from the color of your choice until end of turn.

Summoner's Pact

Search your library for a green creature card, reveal it, put it into your hand, then shuffle.
At the beginning of your next upkeep, pay {2}{G}{G}. If you don't, you lose the game.

Last Chance

Pact of the Titan

Create a 4/4 red Giant creature token.
At the beginning of your next upkeep, pay {4}{R}. If you don't, you lose the game.

Manamorphose

Add two mana in any combination of colors.
Draw a card.

Final Fortune

Lotus Petal

{T}, Sacrifice Lotus Petal: Add one mana of any color.

Stunning Reversal

The next time you would lose the game this turn, instead draw seven cards and your life total becomes 1.
Exile Stunning Reversal.