First of all it fixes for any color, giving it a lot of flexibility, but it also transforms into a sizable 5/5, which can be key for the middle of your game, or act as a life saving chump blocker closer to the end
Im most inclined to suggest a Voltron playstyle for Kefka, since both halves benefit from combat buffs, but honestly, you can build any deck around him
it has decent flexibility, but isnt loaded with the same level of high impact options that Riveteers Charm has
In Commander, a commander that would move to the graveyard or exile can instead be placed here by its owner, allowing future recast
3 Don't Move White Don't Move is a Sorcery card that is very dangerous for opponents who attack with numerous cards