Cunning of the Dryads

Cunning of the Dryads enters the battlefield
with X Dryad counters on it.
Remove a Dryad counter from Cunning of the
Dryads: Populate. If the last Dryad counter is removed, sacrifice Cunning of the Dryads.
If a +1/+1 counter is put on a creature, put
twice that many +1/+1 counters on it. If a loyalty counter is put on a planeswalker, put twice that
many loyalty counters on it.