The Lost Caverns of Ixalan

Cogwork Wrestler | Artifact Creature | Gnome | Flash When Cogwork Wrestler enters the battlefield, target creature an opponent controls gets -2/-0 until end of turn. | Tomek Larek

The Enigma Jewel | Legendary Artifact | | The Enigma Jewel enters the battlefield tapped. {T}: Add {C}{C}. Spend this mana only to activate abilities. Craft with four or more nonlands with activated abilities {8}{U} ({8}{U}, Exile this artifact, Exile the four or more from among other permanents you control and/or cards in your graveyard: Return this card transformed under its owner's control. Craft only as a sorcery.) | Martin de Diego Sádaba

Orazca Puzzle-Door | Artifact | | {1}, {T}, Sacrifice Orazca Puzzle-Door: Look at the top two cards of your library. Put one of those cards into your hand and the other into your graveyard. | Cristi Balanescu

Relic's Roar | Instant | | Until end of turn, target artifact or creature becomes a Dinosaur artifact creature with base power and toughness 4/3 in addition to its other types. | Nino Vecia

Spyglass Siren | Creature | Siren Pirate | Flying When Spyglass Siren enters the battlefield, create a Map token. (It's an artifact with "{1}, {T}, Sacrifice this artifact: Target creature you control explores. Activate only as a sorcery.") | David Astruga

Waterlogged Hulk | Artifact | | {T}: Mill a card. (Put the top card of your library into your graveyard.) Craft with Island {3}{U} ({3}{U}, Exile this artifact, Exile an Island you control or an Island card from your graveyard: Return this card transformed under its owner's control. Craft only as a sorcery.) | Artur Treffner