are holo energy cards rare Water - 019 Anyone know the origin of

It obviously synergizes perfectly with the Channel mechanic, which triggers the discard effect, and lets you recast the same card from the graveyard

The World Champions Pack mentioned above comes to mind, but was only sold as 25-card booster packs and no booster boxes were available a.f.a.i.k

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These are extremely hard to find, and almost non-existence

To do this, simply go the Decks tab on the Arena homepage, go down to Collection