Night Fury, the Unholy

Ravenous (This creature enters the battlefield
with X +1/+1 counters on it. If X is 5 or more,
draw a card when it enters)
Flying, haste, vigilance, flash, double strike,
menace, trample
When Night Fury, the Unholy enters the battlefield, put X +1/+1 counters on all dragons
under your control.