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
Basically any deck with lots of card draw can make excellent use of Burgeoning, and it feels like thats more and more decks each day
But an important part of any deck is to think about how it works if the commander gets permanently/repeated removed, stolen, or Frogify'd
In spite of ATK being the same level as a low-level attacker, Effect Monsters, Bounce/Exclude, and Lack of resistance to commonly used removal methods is fatal
They search eBay before they even know what condition their card is in, or they rely on a single listing price instead of completed sales
For collectors, here are the most expensive Lorcana cards to watch out for