Louis, Seeker of Blood

+1: Create a Blood Bead token (It's an artifact with "Tap, Sacrifice this artifact: You gain 2 life.")
-3: Search your library for a card named Enduring Crimson or Blood Code: Prometheus, put it onto the battlefield, then shuffle your library.
-7: You get an emblem with "At the beginning of your upkeep, create a 2/2 Revenant creature token with undying, and draw a card"