The Lost Caverns of Ixalan

Matzalantli, the Great Door // The Core | Legendary Artifact // Legendary Land | | {T}: Draw a card, then discard a card. {4}, {T}: Transform Matzalantli, the Great Door. Activate only if there are four or more permanent types among cards in your graveyard. (Artifact, battle, creature, enchantment, land, and planeswalker are permanent types.) // (Transforms from Matzalantli.) Fathomless descent — {T}: Add X mana of any one color, where X is the number of permanent cards in your graveyard. | Piotr Dura

Roaming Throne | Artifact Creature | Golem | Ward {2} As Roaming Throne enters the battlefield, choose a creature type. Roaming Throne is the chosen type in addition to its other types. If a triggered ability of another creature you control of the chosen type triggers, it triggers an additional time. | Anastasia Balakchina

Tarrian's Soulcleaver | Legendary Artifact | Equipment | Equipped creature has vigilance. Whenever another artifact or creature is put into a graveyard from the battlefield, put a +1/+1 counter on equipped creature. Equip {2} | Marzena Nereida Piwowar

Threefold Thunderhulk | Artifact Creature | Gnome | Threefold Thunderhulk enters the battlefield with three +1/+1 counters on it. Whenever Threefold Thunderhulk enters the battlefield or attacks, create a number of 1/1 colorless Gnome artifact creature tokens equal to its power. {2}, Sacrifice another artifact: Put a +1/+1 counter on Threefold Thunderhulk. | Xavier Ribeiro

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

Treasure Map // Treasure Cove | Artifact // Land | | {1}, {T}: Scry 1. Put a landmark counter on Treasure Map. Then if there are three or more landmark counters on it, remove those counters, transform Treasure Map, and create three Treasure tokens. (They're artifacts with "{T}, Sacrifice this artifact: Add one mana of any color.") // (Transforms from Treasure Map.) {T}: Add {C}. {T}, Sacrifice a Treasure: Draw a card. | Néstor Ossandón Leal