Commander Masters

Land

{T}: Add {C}.
{4}: This land becomes a 3/3 Citizen creature with vigilance until end of turn. It's still a land. This ability costs {1} less to activate for each legendary creature and planeswalker you control.

Mobilized District

Streets of New Capenna

Basic Land — Island

Island

The List

Land — Gate

This land enters tapped.
When this land enters, sacrifice it unless you pay {1}.
{T}: Add one mana of any color.

Gateway Plaza

When this land enters, if you control two or more Gates, you gain 3 life.
{T}: Add {C}.
{T}: Add one mana of any type that a Gate you control could produce.

Plaza of Harmony

Jumpstart

Basic Land — Plains

Plains

Basic Land — Swamp

Swamp

Modern Horizons

Snow Land

{T}: Add {C}.
{1}{S}: Until end of turn, this land becomes a 2/3 Construct artifact creature. It's still a land. ({S} can be paid with one mana from a snow source.)
Whenever this land deals combat damage to a creature, tap that creature and it doesn't untap during its controller's next untap step.

Frostwalk Bastion

Ravnica Allegiance Promos

Land — Plains Island

({T}: Add {W} or {U}.)
As this land enters, you may pay 2 life. If you don't, it enters tapped.

Hallowed Fountain

Guilds of Ravnica

Enchantment — Aura

Enchant land
When this Aura enters, draw a card.
Enchanted land has "{T}: Add one mana of any color."

Urban Utopia