Bone Mask

, : The next time a source of your choice would deal damage to you this turn, prevent that damage. Exile cards from the top of your library equal to the damage prevented this way.

Final Fortune

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

Sworn Defender

: Sworn Defender’s power becomes the toughness of target creature blocking or being blocked by Sworn Defender minus 1 until end of turn, and Sworn Defender’s toughness becomes 1 plus the power of that creature until end of turn.