I dont really need to mention how valuable it is alongside infinite token combos, do I
Basically, it allows to change, once per turn, an Ultra Beast in the Active Position for another one in the Bench , which serves to optimize resources by not having to waste Energies in retreats and changes, and saves space in the decks by not depending on cards like X-Speed or Leaf to save retreat cost
"This attack does 30 the number of Energy attached" means your damage has no ceiling
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The more sensible reason: should graveyard-based combos become fast enough, being able to deploy a Crypt without breaking up your curve can ensure you keep up
Creatures are easier to kill
