The unupped should cost less than the corresponding unupped.
The upped should cost less than the upped.
If their costs are 2 / 7, your costs may be 1 / 6, or 1 / 0, so long as they aren't
5 /
5. I hope that helped.
On a semi-related note, if the card you are synergizing with has drastically different upped and unupped mechanics, you ARE allowed to only synergize with one version of it, just make that clear in the notes