The set has an incredibly rich source material to work with, and also a setting, a nuclear apocalypse, that's new to MTG as a whole
And for the cost of just one ink, it's a cheap way to dig through your deck for just the card you need
Aurora, Dreaming Guardian Protect your characters from being banished Sleeping Beautys princess is the ultimate support card in The First Chapter, coming in strong with the power to grant Ward to all of your other characters on the field
Ultros gives you a great way for those kinds of spells to interact with your opponents creatures and slow them down, giving you more time to cast awesome spells
It's also good in tribal Snake decks built around Kaseto, Orochi Archmage or Seshiro the Anointed
I use this term loosely but am mostly looking for card draw or any spell that nets me 2+ non-land cards in hand / directly into play 10 sources of "card advantage;" split between creature / artifact / enchantment removal 6 targeted removal, creature-light decks might want one more, creature-heavy decks might want one less 3 board wipes