A lot of stuff in this game just go over people's heads, and Stardash Buster is one of them. For that matter it didn't look like it did that much in Japan either but just his sheer EXISTANCE is enough to cause this game to be unplayable in many directions.
Removing cost 5 or less and then having such an easy go at the shields is so tactically strong that it's just not worth trying to make any kind of long term setups from cost 5 or less creatures.
Now of course the game has progressed a bit in 8 sets but Buster already busted this game.
Deck is just a straightforward beatemup rush, as focused as possible on speed and breaking, even tho'with Fire/Nature you can get a lot of creature survivability too (but this is not worth it because Darkness removal is just super cheap).
Fast Attack Magnum was actually not fast enough for this deck but its ok if you need to slow down against certain decks, like Door. I went with Sonkun to counter Heaven's Gate personally. Ogre Nobushi is also very good to shutdown other early stuff.
Not the best kind of offensive deck anymore but its a perfect landmark point in the game. If your deck is not fast or strong enough to survive something like this or at least have a fighting chance, then you are NOT playing DM properly.