Why Magic changed Raphael’s weapon in its TMNT crossover

I keep telling myself and those around me to get into Magic: The Gathering as a hobby, but so far I’ve held off, knowing I will easily spend way too much money on it. I thought the new Teenage Mutant Ninja Turtles crossover would be the thing that finally made me take the leap. The art is incredible, and the cards make creative use of established canon — for the most part, anyway. Wizards of the Coast, the company behind Magic, did make some changes. As much as I'd love to say they're welcome, though, they seem to serve no purpose other than to look cool.