The Lost Caverns of Ixalan

Braided Net // Braided Quipu | Artifact // Artifact | | Braided Net enters with three net counters on it. {T}, Remove a net counter from Braided Net: Tap another target nonland permanent. Its activated abilities can't be activated for as long as it remains tapped. Craft with artifact {1}{U} // {3}{U}, {T}: Draw a card for each artifact you control, then put Braided Quipu into its owner's library third from the top. | Diego Gisbert

The Everflowing Well // The Myriad Pools | Legendary Artifact // Legendary Artifact Land | | When The Everflowing Well enters, mill two cards, then draw two cards. Descend 8 — At the beginning of your upkeep, if there are eight or more permanent cards in your graveyard, transform The Everflowing Well. // (Transforms from The Everflowing Well.) {T}: Add {U}. Whenever you cast a permanent spell using mana produced by The Myriad Pools, up to one other target permanent you control becomes a copy of that spell until end of turn. | David Álvarez

Brass's Tunnel-Grinder // Tecutlan, the Searing Rift | Legendary Artifact // Legendary Land | // Cave | When Brass's Tunnel-Grinder enters, discard any number of cards, then draw that many cards plus one. At the beginning of your end step, if you descended this turn, put a bore counter on Brass's Tunnel-Grinder. Then if there are three or more bore counters on it, remove those counters and transform it. (You descended if a permanent card was put into your graveyard from anywhere.) // (Transforms from Brass's Tunnel-Grinder.) {T}: Add {R}. Whenever you cast a permanent spell using mana produced by Tecutlan, the Searing Rift, discover X, where X is that spell's mana value. | Cristi Balanescu

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