It reminds me a lot of Duskmourn in terms of having some types matter themes, keywords that have strong constructed implications, while not having pre-built decks in it
Other Equipment Theres also a bunch of other cool Equipment cards, including a cycle for each of the five colors
Who knows what it will sell for were he to ever sell it, as collector items like these really embody the its worth whatever someone is willing to pay mantra
So, if you mulligan twice, you put 2 cards on the bottom
Polluted Cistern // Dim Oubliette is only okay, I think
For example, if you combine it with Guide of Souls, you can make sure you get an energy back every time a creature enters the battlefield