The super-powerful VMAX Sylveon is basically a Dynamax-ed version of Sylveon V, like the mechanic in Pokmon Sword & Shield that enlarges Pokmon
He'd been trying to take advantage of Master of Cruelties, a card that had captured the imaginations of more than a few readers, and realized that Master of Cruelties doesn't actually need power to reduce an opponent to 1 life (although it's certainly worse against creatures if it doesn't have any), so he could use Heartless Summoning to play Master of Cruelties, since he was planning to make it unblockable with Rogue's Passage anyway
The developer's most recent Link-focused deck, Maliss, greatly expanded what these decks could do with their combos while also showing how a deck could interact with banishment without it being a drawback
Green has a huge stable of artifact and enchantment removal, so having a spell with additional functionality is quite good
Also, for those who like their Magic cards shiny, this set will be your first time reasonable opportunity to get the card in foil, as before this the only foil version was a judge promo given out to a select few
