Acnologia, The Dragon King

Flying, Hexproof, Vigilance
This Creature gains +X/+X for every Dragon in
your graveyard. If there are 7 or more Dragons in
your graveyard, it gains indestructible and
deathtouch.
This creature can block any number of creatures.
Whenever this creature destroys a Dragon or
Wizard, this creature gains a +1/+1 counter.