This is my question! Combining cards would be intense, as there's such a low supply of PRO cards haha. But maybe that's the idea?
Unless to level a PRO card, you burn the "un-pro" version of it to create nice sinks for the millions of NFTs out there :D
I have to assume like most RSG burn/blend operations these days there will also be a STARPRO cost.
Yes there will be small STARPRO costs involved.