Huge difference between Dragon and this is - you get to play dragon as you draw it. 2 drakes can win you a game, 2 of these can only lose you the game
When you have 3 dragons out, and opponent kills one with say Lightning, you still have 2 doing 20 damage per turn.
Still, I think its a fun mechanic, and its just a matter of nailing down right numbers. Lets put this in trainer and test it!