Aggrol's Journey

Whenever you cast an elemental creature or Aggrol planeswalker, put a Quest counter on Aggrol's Journey.
When you put the 15th Quest counter on Aggrol's Journey, put 3 loyalty counters on each Aggrol planeswalker you control and a +1/+1 counter on each elemental you control. As long as Aggrol's Journey has at least 15 Quest counters on it, elementals you control have trample.