While the Buster Sword is better some might call it busted The Masamune is more niche but still hugely powerful with the right deck strategy
If you are looking for a deal on Pokemon products and dont really care what they are (as long as they are from relatively recent expansions), Costco could be the place for you
While its looking likely that the Winter drop will be coming with Snapcaster Mage, nothing is definite, so dont go buying 10 copies banking on it being present
However, you may find it useful in regards to certain cards appearing more frequent than others
On the other hand, a high cmc deck that wants to win on turns 10+ will want a higher land count so you can consistently hit your land drops on turns 5+
A 2/2 with flying that you can flip into something much scarier is very handy, especially if your opponent is lacking ways to deal with any kind of evasion