I'm not agree. I think there is few card which is versatile inside the wonder sky, some of it has been use through the KOG deck. For me, cards like diskblade rider, rising energy and twister is very useful in beatdown deck.
He does have a point though, wonder of sky only have 4 cards that are decent: Dessert Twister, Diskblade Rider, Birdface, and Sonic Duck. You need 3 of each for them to be competitive. 3 of them being UR/SR which means multiple reset is necessary but the rest being either craps or just niche at best so you need to spend a lot and only get little
Nope, there is rising energy that i use as replacement for mirror wall. Plus, since it just mini box, its easier to pull all the ur and sr compare to main box. To be truth, i already complete this box just using gems without spend real money