Eldrin, the Veil-Binder

Menace, Ward—Discard a card.

Whenever Eldrin deals combat damage to a player, surveil 2 then draw a card.

Delirium—As long as there are four or more card types among cards in your graveyard, Eldrin has "When this creature dies, create Eldrin Undone, a
5/5 legendary black Demon creature token with flying and ward—discard a card."