Reach for the Sky for me is a bit too expensive, the effect is powerful and will certainly generate blow out scenarios, but the downside of a 4 mana combat trick is that if your opponent has instant speed removal, you are in trouble and often end up with bad trades
BSU cards are the shadowed borders most people have in their collection
This has the potential to set you up for the rest of the game
[3] As of now, the highest HP in the card game is 340 (Metagross EX, Paladin EX, etc.), and the highest attack value is 300 (Charizard VMAX, Pikachu EX, etc.)
With this in mind, it seems unlikely that Glorious End will show up in the main deck, but it could be a sideboard option for specific matchups (it's a hilariously effective way to win the mirror)
Although its not on this list, Pouncing Shoreshark also fits into this line, and putting both of them back is full of value