That's the Groom's Cake right there. It was made, we're told, by Rick's Bakery in Fayetteville. And they did a pretty good job, too! Wanna see him cutting into it?
If we had to guess, we'd theorize that the cake symbolizes a "new hand", and by cutting into it, Morgan is seeing what his new life will hold. Or it could be that he just really likes Magic. Let's take a look at the happy couple!
Congratulations, Morgan and Kristen. The magicthegathering.com team wishes you all the best!