Nylea's Mangrove

Constallation - Whenever Nylea's Mangrove or
another enchantment enters the battlefield
under your control, put a Nyx counter on
Nylea's Mangrove, and it gains "{t}: Add X mana
of any color to your mana pool, where X is
the number of Nyx counters on Nylea's
Mangrove" until end of turn.
At the end of each turn, remove all counters
from Nylea's Mangrove.