Collectors buy them purely for potential, hoping a rare card hides inside
If multiple creatures enter the battlefield at the same time, evolve may trigger multiple times, although the stat comparison will take place each time one of those abilities tries to resolve
If all friendly creatures get double firepower, such as Erratic Cyclops or Talrand, Sky Summoner , the Prismari player can get ahead in a hurry
I forgot to mention what they said in my original comment, it should be updated now
If you decide to activate it for some silly reason, it'll try to present you with a list of colors to choose from to add to your mana pool, find an empty list since you have no commander, and finish resolving without doing anything at all
Use some other real cards as a reference when you do this test