Sheoldred

Sheoldred Legendary Creature — Phyrexian Praetor

Menace When Sheoldred enters, each opponent sacrifices a nontoken creature or planeswalker of their choice. : Exile Sheoldred, then return it to the battlefield transformed under its owner's control. Activate only as a sorcery and only if an opponent has eight or more cards in their graveyard.

The True Scriptures Enchantment — Saga

(As this Saga enters and after your draw step, add a lore counter.) I — For each opponent, destroy up to one target creature or planeswalker that player controls. II — Each opponent discards three cards, then mills three cards. III — Put all creature cards from all graveyards onto the battlefield under your control. Exile this Saga, then return it to the battlefield (front face up).