Arborial, Overgrown City

When Arborial, Overgrown City enters the battlefield, each land you control taps for two
mana of any type it can produce until end of
turn.
When Arborial, Overgrown City enters the
graveyard from the battlefield, untap each land
you control.
Arborial's walls and ceiling protected plant life on Apocalynia through the long apocalypse cycle.