You could always play Sheoldred to get a similar effect, a big body that snowballs if you untap with it
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Dark Armed Dragon was an Evil Counterpart to Armed Dragon LV7 and one of many "Dark" counterparts to other monsters, but was otherwise unrelated to them and had no synergy with them
Being strictly worse than Rattleclaw Mystic is pretty bad, even for a deck sorely wanting early acceleration
Merlin could singlehandedly bolster any deck running Sapphire, and will most certainly replace the other Floodborn character of the same cost, Gaston Intellectual Powerhouse
Each comes with a download code that gives players access to some in-game goodies