HitPaw FotorPea is great for everyone
While I dont have confirmation that Ultimate Masters wont have more rares than a normal Masters set, I strongly suspect that twenty mythics will prove the only hinky print run exception
That means it's likely that your opponents will have larger creatures, meaning they'll be drawing the cards, and that you'll only be adding two to three mana off of Selvala's ability, most times
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
Blastoise and Venusaur got the first Mega Evolutions of the set, with many more to come
There was no certainty that the game would exist the next year, let alone 25 years later