Dark Horizon enters tapped.
{T}: Add {C} or {B}.
{1}, Discard Dark Horizon: Scry 2.

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

Drizzling Cloister enters tapped.
{T}: Add {G} or {U}.
{T}, Discard another card named Drizzling Cloister: Draw a card.

Edgeland Market enters tapped unless you control a basic non-Mountain land.
{T}: Add {R}.
{2}{R}, {T}: Create a 0/1 white Goat creature token.

First strike, lifelink
When this creature transforms into Eleanor, Kingslayer, exile up to one target creature. If that creature was legendary, put two +1/+1 counters on Eleanor.

Ephemeral Mire enters tapped.
{T}: Add {U} or {B}.
{4}{U/B}: Until end of turn, Ephemeral Mire becomes a 3/2 black and blue Horror creature until end of turn and can't be blocked this turn. It's still a land. This ability costs {X} less to activate, where X is your devotion to black and blue. Activate only once each turn.

At the beginning of each combat, until end of turn, creatures you control have base power equal to the greatest base power among creatures you control and have base toughness equal to the greatest base toughness among creatures you control.

{T}: Add {C}.
{2}, {T}: For each color among permanents you control, add one mana of that color.

{T}, Sacrifice Evolving Wilds: Search your library for a basic land card, put it onto the battlefield tapped, then shuffle.

Executive Office enters tapped.
{T}: Add {B} or {R}.
{4}: Make a pledge. Activate only as a sorcery.

You may have Extravagant Patisserie enter tapped. When you do, create a Food token.
{T}: Add {C}.

Field Laboratory enters tapped.
{T}: Add {G} or {U}.
{1}, Discard Field Laboratory: Scry 2.

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.