Sanguine Bond

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

Bloodthirsty Aerialist

Flying
Whenever you gain life, put a +1/+1 counter on Bloodthirsty Aerialist.

Flying
Whenever you gain life, target opponent loses that much life.

Whenever you gain life, put a +1/+1 counter on Bloodbond Vampire.

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.

Whenever you gain life, you may pay {X}, where X is less than or equal to the amount of life you gained. If you do, draw X cards.