Adventure is among the most evocative mechanics in recent memory, creating an instant story within a single card
Thoughtseize represents a way to trade resources quickly and efficiently, and once you can force that Galerider Sliver to stand on its own, your more powerful cards will win their individual battles
Beyond these, however, are a bunch of other options that are much more tenuous, but very exciting all the same
There are no guarantees of course, but I could really see Affinity being a new player in Standard post-Aetherdrift.
Take, for instance, the below works on Yidris, Maelstrom Wielder by Michiko Kanda Sablan of Sablan MTG Alters, Nin, the Pain Artist by Toriy Abdel of Magic Fantasy, and on Arixmethes, Slumbering Isle by Marisa Capitao of Captain Magic Altered
Then if you control three or more Bears, draw two cards