Secret Identity for instance, features a heroic possum or rat from Bloomburrow wearing a mask to make themselves look like a racoon
In addition to painting a huge target on your back, it puts a stop to cascade, flashback, and a whole bunch of other shenanigans
That also pushes it towards good stuff soup, but many 5-color commanders suffer from that
While green can acquire eight mana relatively easily, it takes a while longer for white to gather similar resources
Here are my general guidelines for deciding whether to name Human, Illusion, or Wizard in those spots: If you have an Aether Vial on the battlefield, you should prioritize Mantis Rider or Deputy of Detention above Phantasmal Image
But everyone knew that the meld cards, especially Urza, were going to be a major focus of the set, so we had to get it right