Need some good rank up advice! (Please respond)

Just finished v4 100% now and got a mutant 4-5 gem! Domino? Also have so many other gems and need to know if I should hold them or use it. Already have sparky at r5 as far as tech goes, and void and cap IW at rank 5 for science. I could use the science 3-4 on gulk for v1 exploration or wasp (no 5* ghost) or save for thing. I could use a tech 3-4 gem on IMIW or doc ock, or wait to pull ghost. 







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Comments
Rank ghulk
Hold on IMIW