The Lost Caverns of Ixalan

Ancestral Reminiscence | Sorcery | | Draw three cards, then discard a card. | Artur Treffner

Frilled Cave-Wurm | Creature | Salamander Wurm | Descend 4 — Frilled Cave-Wurm gets +2/+0 as long as there are four or more permanent cards in your graveyard. | Aaron Miller

Out of Air | Instant | | This spell costs {2} less to cast if it targets a creature spell. Counter target spell. | Francisco Miyara

Unlucky Drop | Instant | | Target artifact or creature's owner puts it on the top or bottom of their library. | Patrik Hell

Waylaying Pirates | Creature | Human Pirate | When Waylaying Pirates enters the battlefield, if you control an artifact, tap target artifact or creature an opponent controls and put a stun counter on it. (If a permanent with a stun counter would become untapped, remove one from it instead.) | Zoltan Boros