The Lost Caverns of Ixalan

Kellan, Daring Traveler | Legendary Creature | Human Faerie Scout | Whenever Kellan, Daring Traveler attacks, reveal the top card of your library. If it's a creature card with mana value 3 or less, put it into your hand. Otherwise, you may put it into your graveyard. | Marta Nael

Malcolm, Alluring Scoundrel | Legendary Creature | Siren Pirate | Flash Flying Whenever Malcolm, Alluring Scoundrel deals combat damage to a player, put a chorus counter on it. Draw a card, then discard a card. If there are four or more chorus counters on Malcolm, you may cast the discarded card without paying its mana cost. | Fesbra

Souls of the Lost | Creature | Spirit | As an additional cost to cast this spell, discard a card or sacrifice a permanent. Fathomless descent — Souls of the Lost's power is equal to the number of permanent cards in your graveyard and its toughness is equal to that number plus 1. | Nils Hamm

Inti, Seneschal of the Sun | Legendary Creature | Human Knight | Whenever you attack, you may discard a card. When you do, put a +1/+1 counter on target attacking creature. It gains trample until end of turn. Whenever you discard one or more cards, exile the top card of your library. You may play that card until your next end step. | Victor Adame Minguez

Intrepid Paleontologist | Creature | Human Druid | {T}: Add one mana of any color. {2}: Exile target card from a graveyard. You may cast Dinosaur creature spells from among cards you own exiled with Intrepid Paleontologist. If you cast a spell this way, that creature enters the battlefield with a finality counter on it. (If a creature with a finality counter on it would die, exile it instead.) | Irina Nordsol

Amalia Benavides Aguirre | Legendary Creature | Vampire Scout | Ward—Pay 3 life. Whenever you gain life, Amalia Benavides Aguirre explores. Then, destroy all other creatures if its power is exactly 20. (To have this creature explore, reveal the top card of your library. Put that card into your hand if it's a land. Otherwise, put a +1/+1 counter on this creature, then put the card back or put it into your graveyard.) | Alix Branwyn

Throne of the Grim Captain // The Grim Captain | Legendary Artifact // Legendary Creature | // Skeleton Spirit Pirate | {T}: Mill two cards. Craft with a Dinosaur, a Merfolk, a Pirate, and a Vampire {4} ({4}, Exile this artifact, Exile the four from among permanents you control and/or cards in your graveyard: Return this card transformed under its owner's control. Craft only as a sorcery.) // Menace, trample, lifelink, hexproof Whenever The Grim Captain attacks, each opponent sacrifices a nonland permanent of their choice. Then you may put an exiled creature card used to craft The Grim Captain onto the battlefield under your control tapped and attacking. | Tiffany Turrill