Some of the best things you can copy include cards with enter the battlefield effects, or ones with exceptionally powerful attack triggers
Because of the higher (about one out of every nine games) chance of flooding, I build my decks assuming I'll hit my drops to turn four or five (I also tend to build with a lot of ramp) and will reliably have a lot of mana, especially going into the late game
This is for set rotation
Which Im really excited about
That being said, in decks like Atraxa, Praetor's VoiceAtraxa, Praetor's Voice, Pir, Imaginative RascalPir, Imaginative Rascal, Vorel of the Hull CladeVorel of the Hull Clade, or other Proliferate decks, this is another option to go alongside Astral CornucopiaAstral Cornucopia, Everflowing ChaliceEverflowing Chalice, and Pyramid of the PantheonPyramid of the Pantheon
It's also worth keeping in mind that Ashiok, Dream Render can be good against some Field of the Dead decks since it shuts down our opponent's ability to search their library for lands with cards like Golos, Tireless Pilgrim or Circuitous Route