MArcomage

Uncommon, 0/0/0
Discard all cards from hand and receive 7 Hidden treasure and 1 rare card.
- 50% stock (min -10 stock)

It's zero-cost, but it's too expensive. Stock loss is really huge, and drawing a rare doesn't worth 7 Hidden treasures in hand. It's like Sheath your swords without limitations that affects only your hand. I'd rather take Scepter of evolution which has direct 8/8/8 cost and can draw MUCH better hand, Scepter of summoning whose relatively high direct cost is still much less than side effects of this one, or, in case of zero-cost deck, risky Second chance which costs 1/1/1.

I would suggest making it just -10 stock and drawing a Rare from your deck rather than at random, and I probably still wouldn't use it.

This might be nice in a zero-cost deck where you can expect to draw cards that reward you for having a mess of Hidden treasures on hand afterward, and it may have some use in decks where you're striking your own facilities down to 1, but I don't use either of those and can't say I'd ever take it into a deck.