The Lost Caverns of Ixalan

Abyssal Gorestalker | Creature | Horror | When Abyssal Gorestalker enters the battlefield, each player sacrifices two creatures. | Maxime Minard

Chupacabra Echo | Creature | Beast Horror Spirit | Fathomless descent — When Chupacabra Echo enters the battlefield, target creature an opponent controls gets -X/-X until end of turn, where X is the number of permanent cards in your graveyard. | Izzy

Deep-Cavern Bat | Creature | Bat | Flying, lifelink When Deep-Cavern Bat enters the battlefield, look at target opponent's hand. You may exile a nonland card from it until Deep-Cavern Bat leaves the battlefield. | Campbell White

Gargantuan Leech | Creature | Leech | This spell costs {1} less to cast for each Cave you control and each Cave card in your graveyard. Lifelink | Piotr Foksowicz

Soulcoil Viper | Creature | Snake | {B}, {T}, Sacrifice Soulcoil Viper: Return target creature card from your graveyard to the battlefield with a finality counter on it. Activate only as a sorcery. (If a creature with a finality counter on it would die, exile it instead.) | Allen Douglas

Stinging Cave Crawler | Creature | Insect Horror | Deathtouch Descend 4 — Whenever Stinging Cave Crawler attacks, if there are four or more permanent cards in your graveyard, you draw a card and you lose 1 life. | Dan Scott

Synapse Necromage | Creature | Fungus Wizard | When Synapse Necromage dies, create two 1/1 black Fungus creature tokens with "This creature can't block." | Piotr Foksowicz

Visage of Dread // Dread Osseosaur | Artifact // Creature | // Dinosaur Skeleton Horror | When Visage of Dread enters, target opponent reveals their hand. You choose an artifact or creature card from it. That player discards that card. Craft with two creatures {5}{B} ({5}{B}, Exile this artifact, Exile the two from among creatures you control and/or creature cards in your graveyard: Return this card transformed under its owner's control. Craft only as a sorcery.) // Menace Whenever Dread Osseosaur enters or attacks, you may mill two cards. (You may put the top two cards of your library into your graveyard.) | David Auden Nash

Bartolomé del Presidio | Legendary Creature | Vampire Knight | Sacrifice another creature or artifact: Put a +1/+1 counter on Bartolomé del Presidio. | Randy Gallegos

Uchbenbak, the Great Mistake | Legendary Creature | Skeleton Horror | Vigilance, menace Descend 8 — {4}{U}{B}: Return Uchbenbak, the Great Mistake from your graveyard to the battlefield with a finality counter on it. Activate only if there are eight or more permanent cards in your graveyard and only as a sorcery. (If a creature with a finality counter on it would die, exile it instead.) | Steven Belledin

Zoyowa Lava-Tongue | Legendary Creature | Goblin Warlock | Deathtouch At the beginning of your end step, if you descended this turn, each opponent may discard a card or sacrifice a permanent. Zoyowa Lava-Tongue deals 3 damage to each opponent who didn't. (You descended if a permanent card was put into your graveyard from anywhere.) | Campbell White

Akawalli, the Seething Tower | Legendary Creature | Fungus | Descend 4 — As long as there are four or more permanent cards in your graveyard, Akawalli, the Seething Tower gets +2/+2 and has trample. Descend 8 — As long as there are eight or more permanent cards in your graveyard, Akawalli gets an additional +2/+2 and can't be blocked by more than one creature. | Simon Dominic