The casualty ability is nice, but ultimately cards like this are too expensive for how little they accomplish when not used as a combo piece
The comparatively high costs of the dragon creature cards can be absorbed well by the high mana count in the deck, further support is provided by the Dragonmaster Outcast, the Dragonspeaker Shaman or the Dragonlords Servant
They are exhausting their customers by oversupplying, outpacing, and creating loyalty fatigue
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Mistrise Village and Outrageous Robbery out of the sideboard do give a new angle of attack, at least, though battling against decks with lots of counter magic is still difficult
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