Elothi of The Scalekin

Whenever Elothi or another Dragon, Drake,
or Wurm enters the battlefield under your control, put a +1/+1 counter on it and it
gains one of the following: Vigilance, "can't
be countered", Haste, or Trample.
If you control 5 or more Dragons, Drakes, or Wurms with +1/+1 counters on them, transform Elothi.