Oro, The Final Seed

{t}: Put an awakening counter on Oro, The Final Seed.
{t}, Remove an awakening counter from Oro, The Final Seed: Add {w} or {b} to your mana pool.
Sacrifice Oro, The Final Seed: Put an X/X White and Black Horror onto the battlefield with lifelink, where X is the number of awakening counters on Oro, The Final Seed.