At the beginning of your upkeep, you may exile a creature card from a graveyard. If you do, put a +1/+1 counter on Entrails Feaster. If you don't, tap Entrails Feaster.
TrampleWhenever Hystrodon deals combat damage to a player, you may draw a card.Morph (You may cast this card face down as a 2/2 creature for . Turn it face up any time for its morph cost.)
You may choose not to untap Callous Oppressor during your untap step.As Callous Oppressor enters, an opponent chooses a creature type.: Gain control of target creature that isn't of the chosen type for as long as Callous Oppressor remains tapped.
As Cover of Darkness enters, choose a creature type.Creatures of the chosen type have fear. (They can't be blocked except by artifact creatures and/or black creatures.)
Target opponent puts the cards from their hand on top of their library. Search that player's library for that many cards. The player puts those cards into their hand, then shuffles.
Whenever a player cycles a card, you may exile target creature. If you do, return that card to the battlefield under its owner's control at the beginning of the next end step.