When a dragon you control hits a player, you get what I like to call a "super draw," allowing you to pick the best card from the top three cards of your library
Each player draws a number of cards equal to the number of cards they shuffled into their own library
1/1 Rat creature with "This creature can't block." for Edgewall Pack, Experimental Confectioner, Gnawing Crescendo, Harried Spearguard, Lord Skitter, Sewer King, Lord Skitter's Butcher, Ogre Chitterlord, Pest Problem, Rat Out, Redcap Gutter-Dweller, Song of Totentanz, Tangled Colony, Totentanz, Swarm Piper, Twisted Sewer-Witch, Voracious Vermin and Warehouse Tabby
And if you have to draw this card in the later game, you can always put it in your Inkwell
This is particularly exciting with all the mana Myrs, providing a lot of mana ramp broken up between your pre- and postcombat main phases