This card feels like it's both my Johnny and my Spike, as it's fast, and can make enough mana that it ends the game, but requires a heavy commitment to artifacts and certain builds to make that happen
The point here is that when we were looking for cards that just broke away into truly virgin territory, we tended to use artifacts
Once you begin to cast a legendary sorcery, losing control of your legendary creatures and planeswalkers won't affect that spell.
Id keep an eye to see if Body Count is good enough to make its way into more competitive places like CEDH or even (heaven forbid) Legacy
Starter decks are a great way to pick up and play Lorcana, but they're also the beginning of a collection, and some decks have incredibly useful, meta-defining cards in them that will save you from having to buy a lot of singles
Also you're drawing off your opponents' decks not your own which is generally worse since odds there won't be good synergies between the two