As Gideon, it can redirect attacks, grant indestructible, or become a 4/4 itself, so its one of the best cheap creatures to play early in the game
The Cryptbreaker on the other hand provides quick and reliable card draw as well as getting free value with certain from the bin cards or dud draws
As such, holiday cards arent legal in any 60-card formats, nor are they technically legal in Commander
Turning a melded creature over will result in the two cards breaking apart and forming two separate creatures, but they'll probably just get right back together even though she's too good for him
In particular, Aragorn, Hornburg Hero
Don't worry, though, there are still plenty of glimmers from Disney movies to check out