Compared to Scepter of Summoning (cost:15g), this card is ridiculously expensive at 12b 12g -10stock. Even if you play it when you have exactly 12b 12g 0r (and thus completely avoid the stock reduction), it's still more costly than the existing card for the same effect.
Also, for both similarly-named cards, it should be "Altar" rather than "Alter"