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Summoning Stones in Soul Forge--were they changed?

Somewhere I had the idea that the summoning stones summoned only ultra-rare or higher troops. But I just got a bunch of commons and rares. Is that new?

Also, I had an idea that it cost 100 gems to summon a troop. I see it is actually 50. Is that perhaps another change that I totally missed? Or am I just remembering what I want to remember?