Fusion Energy itself can be obtained by defeating either Dawn Wings or Dusk Mane Necrozma in a raid or walking with one of these Pokmon as your buddy
With cards like [c]Heritage Druid[/c], [c]Nettle Sentinel[/c], and [c]Priest of Titania[/c], you can generate loads of mana in a single turn, drawing cards after every creature you play thanks to Glimpse of Nature, and then playing the cards you draw as well
However, the power of understanding strict superiority can help us when evaluating new cards
Walking Ballista | Illustration by Daniel Ljunggren This is a pretty egregious combo to have floating around a Commander precon, especially given the utility of the individual pieces and the fact that this can be assembled so early in the game
This means the deck is weak to decks like Jeskai Black, Mardu Green, Grixis Control, or anything else with this approach