The Lost Caverns of Ixalan

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

Grasping Shadows | Enchantment | | Whenever a creature you control attacks alone, it gains deathtouch and lifelink until end of turn. Put a dread counter on Grasping Shadows. Then if there are three or more dread counters on it, transform it. | Sam Wolfe Connelly

Calamitous Cave-In | Sorcery | | Calamitous Cave-In deals X damage to each creature and each planeswalker, where X is the number of Caves you control plus the number of Cave cards in your graveyard. | Diego Gisbert

Curator of Sun's Creation | Creature | Human Artificer | Whenever you discover, discover again for the same value. This ability triggers only once each turn. | Javier Charro

Geological Appraiser | Creature | Human Artificer | When Geological Appraiser enters the battlefield, if you cast it, discover 3. (Exile cards from the top of your library until you exile a nonland card with mana value 3 or less. Cast it without paying its mana cost or put it into your hand. Put the rest on the bottom in a random order.) | Alix Branwyn

Colossadactyl | Creature | Dinosaur | Reach, trample | Campbell White

Jade Seedstones | Artifact | | When Jade Seedstones enters the battlefield, distribute three +1/+1 counters among one, two, or three target creatures you control. Craft with creature {5}{G}{G} ({5}{G}{G}, Exile this artifact, Exile a creature you control or a creature card from your graveyard: Return this card transformed under its owner's control. Craft only as a sorcery.) | Alexandre Honoré

Caparocti Sunborn | Legendary Creature | Human Soldier | Whenever Caparocti Sunborn attacks, you may tap two untapped artifacts and/or creatures you control. If you do, discover 3. (Exile cards from the top of your library until you exile a nonland card with mana value 3 or less. Cast it without paying its mana cost or put it into your hand. Put the rest on the bottom in a random order.) | Donato Giancola

Scampering Surveyor | Artifact Creature | Gnome | When Scampering Surveyor enters the battlefield, search your library for a basic land card or Cave card, put it onto the battlefield tapped, then shuffle. | Xavier Ribeiro