So, I really like Worn Powerstone in my cube but it has one issue: Since it enters tapped, it doesn't work with Goblin Welder, is a dead draw in storm and combo decks and, in general, is a bit limited in other niche scenarios. I was wondering if I could find a replacement that had a bit more synergy to it.
Any recommendations? Some cards I've been looking at are:
Basalth Monolith ought to be worse in control decks, but perhaps not.
Coalition Relic produces coloured mana, which makes it better than Worn Powerstone. It used to have a reputation as a goodstuff card but I'm not sure if it holds anymore.
Phial of Galadriel has an interesting ability and it seems like it could work well with Welder or big ramp decks that tend to run out of steam, but 3 mana is a lot to just tap for one.
Cursed Mirror used to be in my cube, but I cut it. I'm unsure if it could be decent now. I feel it would have worked if it copied creatures or artifacts, but just creatures is bad.