Parasitic Palisades

Parasitic Palisades enters the battlefield tapped.
•{t} add {c} to your mana pool. ({c} represents colorless mana)
• {t} exert Parasitic Palisades to add X mana of
any color of a permanent that a target
opponent controls, where X is equal to
the number of basic lands the target opponent
controls. (exert means that this card
does not untap on its controller's next
Untap Step)