These decks have been doing well at League Challenges, League Cups, and online Pokemon TCG events
Because the SR pool includes both standard full arts and the 2 SAs, each box has roughly 20% odds of the SR slot being an SA giving you ~1 in 5 chance of walking away with a Mewtwo V SA or Conkeldurr V SA from a single box
Conversely, the same artwork and number repeated five times is one SKU with quantity five, even if tiny print variation makes the copies look slightly different
And theres something to be said about being able to recover from multiple battlefield sweepers by bringing back Skeleton at the end of a players turn, equipping it the hard way with Blackblade Reforged, and crashing someones life total
White Mage's Staff is the card to trigger those, but unfortunately you shouldnt get passed too many of those as its one of the better commons
You would expect most synergy or themed decks to have these kinds of options and power plays but you would also expect the deck to have some real weak spots as well