This is extremely useful when all you have are reactive cards and you need to find more proactive spells: You get to cast whatever you found useful in the 7-card batch, and regain your reactive cards at the end of the turn
The X in the casting cost applies to damage and the number of creatures you target, giving you the flexibility to wipe a board however you want while leaving behind a powerful Enchantment
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The Stasis Coffin is pretty much Teferis Protection outside white
With the amount of ramp we have in the deck, its easy to get X equal to four or five
To avoid being a punching bag, the precon employs a fair amount of removal, along with deterrents like token generators (Talrand, Sky Summoner), pillowfort (Ghostly Prison), and shenanigans (Pramikon, Sky Rampart)