The Lost Caverns of Ixalan

Abuelo, Ancestral Echo | Legendary Creature | Spirit | Flying, ward {2} {1}{W}{U}: Exile another target creature or artifact you control. Return it to the battlefield under its owner's control at the beginning of the next end step. | Victor Adame Minguez

The Ancient One | Legendary Creature | Spirit God | Descend 8 — The Ancient One can't attack or block unless there are eight or more permanent cards in your graveyard. {2}{U}{B}: Draw a card, then discard a card. When you discard a card this way, target player mills cards equal to its mana value. | Victor Adame Minguez

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

Captain Storm, Cosmium Raider | Legendary Creature | Human Pirate | Whenever an artifact enters the battlefield under your control, put a +1/+1 counter on target Pirate you control. | Diego Gisbert

Saheeli, the Sun's Brilliance | Legendary Creature | Human Artificer | {U}{R}, {T}: Create a token that's a copy of another target creature or artifact you control, except it's an artifact in addition to its other types. It gains haste. Sacrifice it at the beginning of the next end step. | Cynthia Sheppard

Deepfathom Echo | Creature | Merfolk Spirit | At the beginning of combat on your turn, Deepfathom Echo explores. Then you may have it become a copy of another creature you control until end of turn. (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.) | Matt Stewart

Nicanzil, Current Conductor | Legendary Creature | Merfolk Scout | Whenever a creature you control explores a land card, you may put a land card from your hand onto the battlefield tapped. Whenever a creature you control explores a nonland card, put a +1/+1 counter on Nicanzil, Current Conductor. | Fariba Khamseh