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@vabeachguy
When I added the 5th to mine, I think it was 2,500 Gems.
Yes, if you add a 4th and 5th Transformer to the Spark Run, it’s permanent.
As for which would be the most effective bot to use, that’s hard to say, not knowing exactly which ones you have. I like Ironhead, but lately I’ve been using Mirage as my #1 in the Spark Run.