Gates to the Underworld enters tapped.
{T}: Add {W} or {B}.
{5}{W/B}: Gates to the Underworld becomes a 3/4 white and black Construct creature with lifelink until end of turn. It's still a land. This ability costs {X} less to activate, where X is your devotion to white and black. Activate only once each turn.

Gleaming Hot Springs enters tapped unless you control a Mountain.
{T}: Add {W} or {U}.

When this land enters, sacrifice it. If you do, search your library for a basic Mountain or Plains card, put it onto the battlefield tapped, then shuffle.
{1}{R}{R}{W}{W}, Discard this card: Creatures you control get +2/+1 until end of turn.

This land enters tapped.
Level up {R}{R}{R}
[level 1-2] Menace
This land is also a creature.
[level 3+] Menace
This land is also a creature.

Groupthink Tank enters tapped.
{T}: Add {W} or {B}.
{4}: Make a pledge. Activate only as a sorcery.

Hallowed Chamber enters tapped unless you control a basic non-Swamp land.
{T}: Add {B}.
{1}, {T}, Sacrifice Hallowed Chamber: Create two Treasure tokens.

At the beginning of your upkeep, you may exile target multicolored card from your graveyard. You may cast a copy of it this turn.

Vigilance
{T}: Add {C}.
{1}, {T}: Add one mana of any color.
Spellcharge 2

Hazakh District enters tapped unless you control an Island, a Swamp, and a Mountain.
{T}: Add {U}, {B}, or {R}.

This land enters tapped.
Level up {B}{B}{B}
[level 1-2] Deathtouch
This land is also a creature.
[level 3+] Deathtouch
This land is also a creature.

High Teqien enters tapped unless you control a basic non-Island land.
{T}: Add {U}.
{2}{U}, {T}, Sacrifice High Teqien: Gain control of target land. Its owner may search their library for a basic land card, put it onto the battlefield, then shuffle.

This land enters tapped.
{2}{G}{W}, {T}: Surveil 1.

Hundred-Handed Pillars enters tapped.
{T}: Add {W} or {U}.
{7}{W/U}: Hundred-Handed Pillars becomes a 4/6 white and blue Giant creature with vigilance until end of turn. It's still a land. This ability costs {X} less to activate, where X is your devotion to white and blue. Activate only once each turn.

Menace
Whenever Imposing Maw deals combat damage to a player, that player loses 3 life unless they discard a card.

Imposing Oddity enters with X +1/+1 counters on it.
Whenever Imposing Oddity becomes spellcharged, put a +1/+1 counter on it.
Spellcharge 4
When Imposing Oddity dies, you may put its counters on another target Ruin you control.

Whenever you attack, double target attacking creature's power and toughness until end of turn.

Interrogation Chamber enters tapped.
{T}: Add {U} or {B}.
{4}: Make a pledge. Activate only as a sorcery.

Deathtouch
When this creature transforms into Iris Flayer, target player draws a card and loses 1 life.

Vigilance, trample
{2}{R}{W}: Any number of target creatures you control have base power and toughness 6/6 until end of turn.

When this land enters, sacrifice it. If you do, search your library for a basic Plains or Swamp card, put it onto the battlefield tapped, then shuffle.
{2}{W}{W}{B}{B}, Discard this card: Exile target nonland permanent.

Flying, trample
If a source you control would deal damage to an opponent or a permanent an opponent controls, you may have it deal twice that much damage instead if it's a Dragon or Iviana planeswalker. Otherwise, it deals that much damage plus 2 instead.

This land enters tapped. As it enters, choose a color.
When this land enters, return a land you control to its owner's hand.
{T}: Add {C} and one mana of the chosen color.

Whenever this creature transforms into Lone Switchblade or another permanent you control transforms, each opponent loses 1 life and you gain 1 life.

This land enters tapped.
{2}{W}{B}, {T}: Surveil 1.