The spectacle cards need to feel noticeably better than the average card to justify the feel-bad moments when stuck in your hand. Light up the Stage or some of the rares manage that; a card that's slightly better than Phyrexian Rager when it works and terrible when it doesn't will lead to a lot of disappointment
I do feel the difference between a 2/2 that draws a card and a 3/2 that draws a card and has a relevant creature type is a huge difference at three mana.
Oh, yeah, I forgot about the creature type, since I have zero human support in my meta. So if multiple black decks in your cube can constantly trigger spectacle and/or are heavy on humans, juggler might be worth a try.
Okay, the context in this fight is pretty obvious I guess:
VS.
I know, Hoarding Dragon exists, but I want something, that actually rewards you for having (multiple) artifacts on the battlefield.
My other red artifact payoff is Galvanic Blast.
VS.
Which one is more fun to play with and against?
Do you like tokens? If you do, then Murmuring Mystic is your man.
Can you take advantage of self-mill? Do you like beefy boys? Then, you should go with Aberrant Researcher.
And which do you personally think is more fun to play with and against?
You mean degenerate with Sprout Swarm, right?
What did we learn about Buyback and repetitive gameplay? They are either super bad or super strong. And in either case they are only fun the first and second time you witness it. Then starts the degeneracy.
I never got any complains about sprout swarm in real life. I think people tend to hate on it just because it was horrible in TSP limited, while it is actually just a sweet build around in the right cube. (Funnily enough it seems to be kinda similar to the mystic, both are hard to stop, both generate free tokens and both need the right deck to really shine.)
In my meta, Sprouty itself is pretty unspectacular. An okay filler at bestwhen you just throw it in a random deck. But there are a few ways to build around it, and this is what gets drafters exited for it. You can do it with typical token payoffs and sacrifice outlets or get more tricky with spell velocity cards and such.
Sprout Swarm is one of my favorite cube cards, period, and me and my playgroup we had so much fun with it already. You have to pull it from my cold, dead hands to get it out of my cube!