For a brief eternity, the truth refracted across a thousand futures.

Prismatic Omen

Lands you control are every basic land type in addition to their other types.

"There would be time later to mourn the lost, to weep for their fallen homes and lost treasures. But for now, they breathed in the untainted air and allowed themselves to hope again."
—*Last Stand of the Realm*

Wilds of Eldraine: Enchanting Tales

Secret Lair Drop

In times of portent, the land sculpts itself in accordance with the sigils burned on the sky.

Shadowmoor

Each land you control will have the land types Plains, Island, Swamp, Mountain, and Forest. They’ll also have the mana ability of each basic land type (for example, Forests can tap to produce {G}). They’ll still have their other subtypes and abilities.

Giving a land extra basic land types doesn’t change its name or whether it’s legendary or basic.