Lord of Bloodshed, Cassian

Flying, Vigilance, Haste, Hexproof

Partner with Nesta Archeron the Emissary (When this creature enters the battlefield, target player may put Nesta Archeron the Emissary into their hand from their library and then shuffle.)

At the beginning of your upkeep, you lose 1 life.
Whenever you lose life you may sacrifice a shadow and target player either sacrifices a creature permanent or pays {1}