Helong

+4: Freeze 4 target creatures and summon a 4/4 crystal dragon with Flying and Haste.
-6: Draw a card. If it's a dragon or dragon related card, draw another card. If you draw 4 cards in a row, summon a 6/6 dragon with Flying and Haste.
-13: Exile all cards except Planeswalkers and Artifacts. Summon an X/X Dragon where X is the Damage and Life of all exiled cards.