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With so many sets in Pioneer, the chance that the energy core is just the best way to build decks to such an oppressive extent is much less likely than it was in Standard because ultimately there are still only two sets that contain these energy cards

Id consider it non-canon from a perspective of cards that are printed, but I think we can agree that its canon if anybody wants to consider it so for the convenience of entertainment

You can look at the Limit Break precon's deckllist by clicking here

They synergize with Aysen Crusader

The problem is that Fiery Temper is simply better than Insult // Injury in most decks and allows for the same play with just two mana