Lifelink (Damage dealt by this creature also causes you to gain that much life.)

When Gluttonous Guest enters, create a Blood token. (It's an artifact with ", , Discard a card, Sacrifice this artifact: Draw a card.")

Whenever you sacrifice a Blood token, you gain 1 life.

Flash

Devour 1 (As this enters, you may sacrifice any number of creatures. This creature enters with that many +1/+1 counters on it.)

Trample

When Gluttonous Troll enters, create a number of Food tokens equal to the number of opponents you have. (Food tokens are artifacts with ", , Sacrifice this artifact: You gain 3 life.")

, Sacrifice another nonland permanent: Gluttonous Troll gets +2/+2 until end of turn.

Ward—Discard a card.

Whenever Graveyard Glutton enters or attacks, exile up to two target cards from graveyards. For each creature card exiled this way, each opponent loses 1 life and you gain 1 life.

Nightbound (If a player casts at least two spells during their own turn, it becomes day next turn.)

This spell costs less to cast for each card type among permanents you've sacrificed this turn.

Flying, trample, haste

Whenever Korvold deals combat damage to a player, put X +1/+1 counters on Korvold and draw X cards, where X is the number of permanent types among cards in your graveyard.