You can use it in Yisan, the Wanderer Bard decks, where you can quickly fetch for it at the moment of need
If the mana ability of that permanent puts any restrictions or riders on the mana it produces, that will apply to all the mana it produces this way
While this version of the mana curve is useful, it isn't a rule of deck building
On the other hand, decks that look likely to survive rotation might actually be good investments since if a deck is good enough to be competitive now with eight sets in Standard, there's a good chance it will be even better after rotation with only five sets making up the Standard format
Usually, a bounce effect is card disadvantage, but because you get a big vanilla creature out of this later, that isnt really the case