Zos, Phyrexian Missionary

: Whenever you would pay life, instead you may remove that many loyalty counters from Zos, Phyrexian Missionary and gain that much life.
+1: Create a 1/1 black horror with "Sacrifice this creature: Put loyalty counters on target planeswalker equal to the number of horrors you control"
-15: Target opponent exiles all creature and artifact cards from their library and puts them on the battlefield under your control.