Woodland Brook

{t}, Tap two untapped lands you control: Add three mana in any combiantion of {u} and/or {g} to your mana pool.
If a creature would enter the battlefield under your control, if you cast it from your hand, that creature enters the battlefield with an additional X +1/+1 counters on it, where X is the total amount of mana produced by Woodland Brook spent to cast it.