The Golem, along with the other creatures mentioned above, means that it becomes incredibly tempting to run cards like Rite of Replication, Cackling Counterpart, Stolen Identity, and so on can you imagine casting a Precursor Golem, copying it with Riku, and then running out a copied Rite of Replication into a copied flashback Increasing Savagery
Another card I was extremely impressed with in sideboarded games was Evolutionary Leap
limited edition Wizards of the Cost trading card included
This would later be addressed, at least in temporary fashion, in Pokmon X/Y where Charizard gained the ability to Mega Evolve into the mighty Mega Charizard X, a Fire and Dragon-type with black scales and blue flame
This makes it fantastic for the new Silverquill Influence deck, which is all about auras