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

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

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