Because Emerald/Steels insane discard engine makes it possible to quickly and effectively reduce your opponents hand to zero, often the card that you bounce back to the hand will also be discarded, making Bruno one of the strongest card removal songs in the game
WB lifegain decks appreciate the extra triggers, and its also a town for synergies, so ramp decks can stabilize early and get the payoffs later
This not only weakens everything on the board but can often be enough to take out whatever took down Bagheera in the first place
Considering how much the ink versions are already going for, I can't imagine how much the Gold Foil variant would actually be valued at, maybe you just win at money and never have to pay for Magic cards again, now that would be nice
For example, if the equipped creature "has flying as long as it's attacking," it will not gain flying, even if it attacks after Colossus Hammer becomes attached to it
Boxes are balanced at the factory