Flooded Morass enters tapped unless you control a basic Island or a basic Swamp.

Flourishing Crevasse enters tapped unless you control a basic Mountain or a basic Forest.

Flying
{T}: Add {C}.
Spellcharge 4

Whenever you attack, create a 1/1 colorless Soldier creature token that's tapped and attacking.

Frostfire Geysers enters tapped unless you control a basic Island or a basic Mountain.

Fungal Mire enters tapped unless you control a basic Swamp or a basic Forest.

{T}: Add {C}.
{T}: Add one mana of any color. Spend this mana only to cast Shrine spells or activate abilities of Shrines.

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.

Glassy Soundvein enters tapped.
When Glassy Soundvein enters, you may pay 1 life. If you do, add one mana of any color other than blue.
{T}: Add {U}.

Gloomcover Steppe enters tapped unless you control a basic Plains or a basic Swamp.

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}.

Heart of the Glade enters tapped unless you control a basic Plains or a basic Forest.

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.

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.

Hyperloop Obelisk enters tapped.
{T}: Add {U}, {B}, or {R}.
{VP}{VP}{VP}{VP}, Discard Hyperloop Obelisk: Untap target creature. It gets +4/+4 until end of turn.

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.