Aerith, Last Ancient offers a lifegain payoff you will almost never pull off in an actual game because aside from Sephiroth, Fallen Hero or Wrecking Ball Arm there's no other way to reliably get her to 7 power and very little lifegain in the deck otherwise
But once she's in play, you may want to keep her out for a while thanks to her ability
Even if you hate Universes Beyond, do you think the cards introduced interesting mechanics that deserve Universes Within versions
Both come with multiple Rares and Super Rares as well as a guaranteed foil Legendary for each deck
The other adventure lands are good as well, but this one allows for recursion of card types, enchantment and artifact, without the restriction White usually gets on mana value and nets us up to two cards in the process
To expand, WU/WB/WR all really like job selects, and GW is a go wide deck