Dragons are large, reptilian, and usually winged. They tend to have powerful breath. There are many old and new stories about dragons, and a few Pyramid games about them also, to wit:
The Looney Labs card game Seven Dragons has not yet (May 2012) been made part of a mashup game with Looney Pyramids, unlike its elder sibling Aquarius. But Aquarius Rising can use the Aquarius Dragon promo card, and some IceQuarius games may easily convert to play with a Seven Dragons deck.