Drastically under-printed, it's only appeared in Urza's Legacy, and as one of those funky-but-divisive Amonkhet invocations
Yu-Gi-Oh in particular suffers from this issue, as power creep often progresses too fast and results in broken cards that greatly warp the meta
This Voltorb's unique Voltaic Chain attack deals higher damage the more electric energy you have attached to other Pokemon in play that also belong to Iono
I get it, playing Magic: The Gathering can feel overwhelming with so many cards and strategies to learn but its not
If you're looking to grab this Mega Dragonite ex early, I'd suggest going to TCGPlayer and getting the Japanese version, as you'll have to wait until January next year to get the Ascended Heroes version of the card
Early on in learning to play Magic you learn about summoning sickness and that it applies to tap abilities. (i.e.: abilities that include the tap symbol as a cost)