This came up in chat, I figure I'll post my thoughts here.
Sealstones. There are certain combinations I'm really not pleased with. For example, the MT stone, then using abilities to boost the damage back to normal, which basically invalidates the sealstone entirely. I don't like that -- I was going to nerf the ability to add attack to people with it, but some people expressed concerns that they're just becoming more problematic than fun.
My personal idea was to have certain people who only come with sealstones. For example, Rand with Firefly, Ricardo with Life. Those would be the only people who got them and would help make them a little bit more... unique.
It was also commented I should just leave them in and I'm okay with that too. I think I just need to come to a consensus on each one that I'm not unhappy with.