Pointed Discussion

You can play this insanely early, but I can't imagine why you'd want to- early creatures are weak, and you'd lose every turn to just keep a weak crature around. But in the late game, this is crazy, and is definitely worth it in most cases.

This plus Opalescence = Infinite Creatures?

Ok, say you have Opalescence out. Then...
step 1. You play dance of many.
step 2. It comes into play already a creature so you have its triggered ability target it.
step 3. A token that is a copy of it comes into play go to step 2 until bored.
step 4. You have an arbitrarily large amount of 2/2s

Give them haste and swing for the win or else you have a very large upkeep to pay.

@lukemol:
It works. With Opalescence, Dance of Many is a nontoken creature. If it targets itself, it would put into play a token that copies the original nontoken creature Dance of Many with all its original abilities, which in turn could create a copy of the original nontoken creature Dance of Many. So yeah, you could have infinite creatures. You have to end it by copying Opalescence or some other creature, of course. Additionally, you will have to use Concordant Crossroads or Eon Hub to not have to deal with the upkeep cost. There's also Mass Hysteria and Fervor, but W/U/R is tougher to balance than W/U/G or W/U.

You wouldn't necessarily need haste if you had out Opalescence and copied this with the token. You could have a sac engine like a Fallen Angel, Nantuko Husk etc for massive creatures, or Ashnod's Altar for infinite colorless mana or Pandemonium to simply kill your opponent.

Combo with the underrated Skull of Orm to get it back regularly.

Back in the early days of Magic art, when a card depicting the flying slug version of Cinderella wasn't out of place.

Dance of many whats exactly? And are they actually "dancing"?

@Tommy9898: Or if you couldn't give them all haste you could just utilize the fact that you're going to have an arbitrarily large number of token creatures ht the graveyard next turn. (remember tokens count as going to the graveyard before "dissoloving")

I've been having fun with this and Sun Titan. It'll pretty much always be a copy of the best creature on the battlefield as if something better comes along, I can just forego the upkeep cost then choose that creature when I bring it back with the Titan.

Of course, the actual deck is an Eye of Singularity deck, so really my Dance of Many reads "UU - destroy target creature", which I'll take when combined with ol' Sun Titan.

Have no idea why this has such a low rating. At it's weakest, it's a 2-blue sorcery that reads "destroy target legendary creature, can't be regenerated". That sounds like a specific but otherwise ho-hum card that might be printed on it's own, but this can give you strategic advantage anytime if you copy your own creatures, especially if your deck has creature-based aggro synergy (Two Undead Warchiefs? Another Ally creature etb?). And has been said in other comments, this is crazy turn two defense against whatever big ass Woolly Thoctar your opponent just played. Great combat stall card, great legendary spot removal, great synergy enabler. I haven't tested it out in my deck yet, but once I do I'll update this comment with a more empirically verified rating and opinion. Looks like it'll be great fun.

Edit - um, yes, everything I said above and then some. Especially now that someone just found an infinite combo for it WHY DIDN'T I SEE THAT DAMMIT!

No, Opalescence wouldn't cause it to create infinite creatures, it would just make it a creature named Dance of Many in addition to being an enchantment.

EDIT: I see how it works now.

The UU upkeep is rough, but otherwise a decent card.

Populate.

Growing Ranks makes this card pretty amazing. clone a creature with dance, then every turn you get another one. combine with something to bounce dance back to your hand and recast if desired or when something better to copy comes out.

So if you make an absurd amount of Dance of Many with the Opalescence combo, and Opalescence is removed from the field in one way or another, the original reverts to being simply an enchantment, but the others remain (enchantment) creatures? Opalescence, you make things so wacky.

Populate!

This is the cheapest method of getting a token copy of something that I have seen so far.

Best two blue spent in a while! I would use it for land D though avalanche riders n man o wars and sowers of temptation million and one uses but no reprints. =S