Climbing Oasis

Defender
Climbing Oasis' toughness is equal to the
number of forests and islands you control.
{g}, {t}, Sacrifice a creature: Add X +1/+1
counters to Climbing Oasis, where X is equal
to that creature's power.
{u}{u}, {t}: Scry equal to Climbing Oasis' power.
{g}{g}{g/u}, {t}: Add blue and/or green mana to
your mana pool equal to your hand size.