Its the kind of thing thats going to end up in nearly every EDH deck, and I always like to see these cards around
Like most Magic: The Gathering cards, the value of Join the Dance depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (Innistrad Remastered)
As it is, I think these decks are just going to run Aetherling or something else
Alternatively, you could buy two of the physical Tarkir: Dragonstorm precons, or basically any video game you like
Most Magic: The Gathering releases have an infinite combo or two if you look hard enough
Who is the Next Player to Get a Spotlight Card