it's just a bit niche
Selvala, Heart of the Wilds This three-drop mono-Green legendary Elf taps with a Green for mana equal to your highest-powered critter, so at least 2 with her counting her own 2/3 body
You can hit Murktide Regents and Karn Liberateds all day long
To make a good deck, you want to focus on just a few strategies instead of all different cards and no real plan
Many decks make a habit, nay, an entire strategy out of returning their artifacts from the graveyard baiting out those removal spells just to return that Mycosynth Lattice to the field or cheat a Portal to Phyrexia into play with a Trash for Treasure
That said, we should expect to see more and more Universes Beyond sets as the basis for experimenting with new design space, and as long as they arent irrevocably changing the meta landscape (Im looking at you, The One Ring), Im excited to see them