This opens up the door to a huge array of powerful combos, but its completely viable in fair decks as well, easily ramping out a power play or two on Treasure mana alone
The creator was able to grab part of the Blind Eternities, the space between planes, and use it to create the Aetherspark but dies in the process
That might be Luminarch Aspirant or Innkeeper's Talent just spicing up your Cube deck with some extra power, or it could be a dedicated build-around seeking to exploit Winding Constrictor and Ezuri, Claw of Progress
How about copying BloodthirsterBloodthirster, or Dragonhawk, Fate's TempestDragonhawk, Fate's Tempest
When you do, choose up to one target creature card exiled this way
On top of that, Bloomburrow also gave us Overprotect, which adds Hexproof and Indestructible on top of Trample for no extra mana cost