Cradle of Alara

Partner with Heart of Alara
Haste, Shroud
At the beginning of your end step, sacrifice all
other nontoken lands you control.
At the beginning of your upkeep, you get a
leyline counter, then create that many Land
tokens. (It's a land with "Exile this land: Add one
mana of any color.", ''Exile this land at the beginning
of your next upkeep.'', and ''This land entering play
doesn't cause abilities to trigger.'')