Gilded Drove

Whenever another Elf with a mana ability enters
the battlefield under your control, put a +1/+1
counter on Gilded Drove
Gilded Drove has trample as long as it has three
or more +1/+1 counters on it.
Gilded Drove has deathtouch and indestructible
as long as it has seven or more +1/+1 counters on
it.
Gilded Drove has vigilance and hexproof as long
as it has thirteen or more +1/+1 counters on it.