The difference is Overwhelming Splendor only affects the enchanted player
At least one option will be a packet you've never selected in a previous run of the event (unless you've selected them all)
Of course, its fine to make maindeck decisions that are influenced by a certain matchup (like Burn), so long as those decisions dont also hamstring you in other matchups
The deck features a number of cards that both allow you to sacrifice permanents and that generate tons of value when you do including many cards with abilities such as card draw, life gain, direct damage, drain, and other powerful effects when you sacrifice a permanent
It served as temporary disruption (Dream Fighter), protection (Mist Dragon), additional downside (Taniwha), and a nifty tweak on looting (Teferis Imp)