Dragon's Egg and Sarkan the Mad
Please, please PLEASE combine the tokens this support creates and the dragon token Sarkhan's second ability creates.
Both create a 5/5 red dragon with flying yet because they have different art, they don't stack as tokens together.
Edit: apparently at higher levels this ability gives a 6/6 dragon. However I would still be willing to sacrifice one power and toughness for the tokens to stack.