Reed Barrier

Reed barrier enters the battlefield with X
+1/+1 counters on it
{t}: add {u}{g} to your mana pool
{g}, remove a +1/+1 counter from Reed Barrier: create a 2/2 green elemental token
{u}{u},{t}: put X +1/+1 counters on Reed Barrier, where X is the number of elementals you control