you've got to have a least 2 complete sets of each combiner for combined and individual modes but 3 would be better.
Have one set, as the combined mode
Have one set, as the individual figures (either mode)
Have two sets of all combiners you own
Have two sets of just iconic combiners
Have three sets to cover all 3 modes
Something else
you've got to have a least 2 complete sets of each combiner for combined and individual modes but 3 would be better.