Just build around them and mine the salt that falls from your friends faces
Try out Kaza, the Roil Chaser for your Wizard typal deck instead of Inalla, Archmage Ritualist. If you want to play a Jund counters deck, set aside Korvold, Fae-Cursed King and try out a Devour deck, perhaps building around Prossh, Skyraider of Kher or Thromok, the Insatiable. Think about Aisha of Sparks and Smoke for your next Boros sorcery build
The first two expansions, Rise of the Floodborn and Into the Inklands, successfully built on and widened the mechanics that the launch set, The First Chapter, introduced
Mega Dragonite settles into the scene like it just belongs there
While Neheb, the Eternal will like it a lot, Im not sure other decks will
With Righteous Valkyrie out, you can play this to get five life straight away, and then another four on your end step when the Harbinger makes an Angel token