MArcomage

Soul pact, Uncommon, 21 gems

Next card will be a rare from your deck
You suffer damage equal to that card's cost


Given that you can summon a Rare from your deck by playing an Uncommon for only 15 gems, this seems unnecessarily reckless.

If you only took Rares with a low cost (there are presently exactly 15 that are 0-cost), this concept could prove useful, but it would still be inferior to Scepter of summoning. I'd say to drop the cost to a single resource. I fear that making it 0-cost would make it synergize with 0-cost decks too well.

I'd say lower cost to 7
and add minimal damage, some 20 maybe

Or to make it real gambling, like a soul pact should be - make it 0-1 cost and mekr it summon rares from whole pool, not just your deck. :)