Draconic Overlord

0: Place a loyalty counter on Draconic Overlord for each dragon you control. Draw a card for each counter placed this way.
-5: Create X 2/2 Red Dragon Creature Tokens with Flying and put them into play. Where X is the number of cards in your hand. You take X damage.
-10: Destroy all non-dragon creatures, create a 4/4 Red Dragon Creature Token with Flying for each creature that died this turn and put it into play.