I think your want list would comprise:
2013/14 SEP Release
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91. Base card - WSW
2014/15 TnP Release
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Base card - Melb City (very hard to find) - Cards in release were not numbered.
2015/16 TnP Release
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99. Base card - Melb City
99. Silver parallel - Melb City
99. Gold parallel - Melb City
MG-06 Midfield Magician
SS-06 Signature card (replacement for Robert Koren)
Others may be able to advise if he appeared in any earlier releases.
I might have a spare MG-06, but others may be able to help you with more.