Sumeru City

{t}: Add one mana of any color. Activate only as
long as Sumeru City is a land.
As long as Sumeru City is your active plane, creatures you control without an elemental
damage type have Dendro. (The elemental damage
types are Anemo, Geo, Electro, Dendro, Hydro, Pyro,
Cryo. Creatures with Dendro put a Dendro element
counter onto creatures when they deal damage, then
check for elemental reactions.)