The Bracket 5 line of acceleration short of the banned Sol Ring partners (Mana Crypt, Jeweled Lotus)
This could also theoretically see some plan in a Lands shell with Thespian's Stage being able to copy it and Loam being able to recur it in order to continue making constructs with it, and that alone could be a real shell for it, except for the fact that Field of the Dead is likely just a better long game card
However, as I built the deck it turned into an Airbending / Go Wide / Sacrifice deck
This locations ability, Underwater Acoustics, gives any character positioned there an additional two points of cost to sing songs
Otherwise, exile the top card of your library face down
Heres what it looks like when I put the Adventure Dragon on the curve based on the Adventure mana, and each Dragon on the curve based on the eminence mana discount: Ah, thats much more like it, dont you think