Phyrexian Arena

At the beginning of your upkeep, you draw a card and you lose 1 life.

Slaughter Pact

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

Whenever you gain life, target opponent loses that much life.
{3}{B}{B}: Creatures you control gain lifelink until end of turn.

Whenever an opponent loses life, you gain that much life.

Search your library for a card, put that card into your hand, then shuffle. You lose 3 life.

Whenever you cast a spell, untap all nonland permanents you control.

Whenever you cast a spell, you gain 1 life for each spell you've cast this turn.
Pay 50 life: This artifact deals 50 damage to any target.

Flying
If an opponent would lose life during your turn, they lose twice that much life instead. (Damage causes loss of life.)