Spirit of Growth

Sacrifice a Spirit: Search your library for a forest
card and put it into play tapped, then shuffle.
Put a growth counter on Spirit of Growth.
Sacrifice a Forest, remove all growth counters
from Spirit of Growth: Search your library for a
spirit with mana value equal or less than the
amount of growth counters removed and put it
onto the battlefield tapped. Activate this ability
only as a sorcery.