Primeval Landscape

Primeval Landscape enters the battlefield
tapped unless you control a mountain.

{t}: Add {r}.

{r}, {t}, Exert Primeval Landscape: Add {r}{r}.
If that mana is spent on a creature spell,
it gains haste until end of turn.
(Exerted permanents don’t untap during
the next untap step.)(Arena of Glory)