Orzhov Syndicate

Creatures you control have Extort and Afterlife 2 (They have "Whenever you cast a spell, you may pay {w/b}. If you do, each opponent loses one life and you gain that much life." and "When this creature dies, create two 1/1 white
and black Spirt creature tokens with flying.")
{x}{w}{b}: Each opponent loses X life and you gain that much life.