I think anything, and I mean literally anything, that puts in into play for CMC 2 merits serious consideration. Black seems like the color that would get some sorcery that was BB Pay 2 life: get the thing.
Calling it the "hot potato" implies you DONT want to hold onto it, though.
I vote for "hat."
So the dude who designed this mechanic is James Hata, a dude who I know very well. I used to play UFS with him and we were on the world championship team the first year of the game.
I remember in UFS there was a card from the Penny Arcade set called The Watch, which ties back into the comics about Gabe and Tycho fighting over a watch. The watch card had a very similar effect where it gets traded back and forth because of combat. When Mike and Jerry from Penny arcade designed a card in M15 it was this:
All I'm saying is perhaps the watch is better.