Ipnu Rivulet

Hidden Cataract

Land — Cave

Hidden Cataract enters the battlefield tapped.
: Add .
, , Sacrifice Hidden Cataract: Discover 4. Activate only as a sorcery. (Exile cards from the top of your library until you exile a nonland card with mana value 4 or less. Cast it without paying its mana cost or put it into your hand. Put the rest on the bottom in a random order.)

Otawara, Soaring City

Legendary Land

: Add .
Channel — , Discard Otawara, Soaring City: Return target artifact, creature, enchantment, or planeswalker to its owner's hand. This ability costs less to activate for each legendary creature you control.

The Surgical Bay

Land — Sphere

The Surgical Bay enters the battlefield tapped.
: Add .
, , Sacrifice The Surgical Bay: Draw a card.

Island

Basic Land — Island

(: Add .)

The Everflowing Well // The Myriad Pools

Legendary Artifact // Legendary Artifact Land

When The Everflowing Well enters the battlefield, 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.

The Myriad Pools

(Transforms from The Everflowing Well.)
: Add .
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.

Ojer Pakpatiq, Deepest Epoch // Temple of Cyclical Time

Legendary Creature — God // Land (4/3)

Flying
Whenever you cast an instant spell from your hand, it gains rebound. (Exile it as it resolves. At the beginning of your next upkeep, you may cast it from exile without paying its mana cost.)
When Ojer Pakpatiq dies, return it to the battlefield tapped and transformed under its owner's control with three time counters on it.

Temple of Cyclical Time

(Transforms from Ojer Pakpatiq, Deepest Epoch.)
: Add . Remove a time counter from Temple of Cyclical Time.
, : Transform Temple of Cyclical Time. Activate only if it has no time counters on it and only as a sorcery.

The Enigma Jewel // Locus of Enlightenment

Legendary Artifact // Legendary Artifact

The Enigma Jewel enters the battlefield tapped.
: Add . Spend this mana only to activate abilities.
Craft with four or more nonlands with activated abilities (, 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.)

Locus of Enlightenment

Locus of Enlightenment has each activated ability of the exiled cards used to craft it. You may activate each of those abilities only once each turn.
Whenever you activate an ability that isn't a mana ability, copy it. You may choose new targets for the copy.

Moonsnare Prototype

Artifact

, Tap an untapped artifact or creature you control: Add .
Channel — , Discard Moonsnare Prototype: The owner of target nonland permanent puts it on the top or bottom of their library.

Unblinking Observer

Creature — Homunculus (2/1)

: Add . Spend this mana only to pay a disturb cost or cast an instant or sorcery spell.

Oaken Siren

Artifact Creature — Siren Pirate (1/2)

Flying, vigilance
: Add . Spend this mana only to cast an artifact spell or activate an ability of an artifact source.

Omen Hawker

Creature — Cephalid Advisor (1/1)

: Add . Spend this mana only to activate abilities.

Volshe Tideturner

Creature — Merfolk Wizard (1/3)

: Add . Spend this mana only to cast an instant or sorcery spell or a kicked spell.

Island // Island

(: Add .)

Island

(: Add .)

Restless Reef

Land

Restless Reef enters the battlefield tapped.
: Add or .
: Until end of turn, Restless Reef becomes a 4/4 blue and black Shark creature with deathtouch. It's still a land.
Whenever Restless Reef attacks, target player mills four cards.

Voldaren Estate

Land

: Add .
, Pay 1 life: Add one mana of any color. Spend this mana only to cast a Vampire spell.
, : Create a Blood token. This ability costs less to activate for each Vampire you control. (It's an artifact with ", , Discard a card, Sacrifice this artifact: Draw a card.")

Field of Ruin

Land

: Add .
, , Sacrifice Field of Ruin: Destroy target nonbasic land an opponent controls. Each player searches their library for a basic land card, puts it onto the battlefield, then shuffles.

Forgotten Monument

Land — Cave

: Add .
Other Caves you control have ", Pay 1 life: Add one mana of any color."

Volatile Fault

Land — Cave

: Add .
, , Sacrifice Volatile Fault: Destroy target nonbasic land an opponent controls. That player may search their library for a basic land card, put it onto the battlefield, then shuffle. You create a Treasure token.

Boseiju, Who Endures

Legendary Land

: Add .
Channel — , Discard Boseiju, Who Endures: Destroy target artifact, enchantment, or nonbasic land an opponent controls. That player may search their library for a land card with a basic land type, put it onto the battlefield, then shuffle. This ability costs less to activate for each legendary creature you control.

Captivating Cave

Land — Cave

: Add .
, : Add one mana of any color.
, , Sacrifice Captivating Cave: Put two +1/+1 counters on target creature. Activate only as a sorcery.