The mystery cards are usually 25 random common cards and 1 rare card, offering very little value
The good news is we actually have a lot of cheap removal and some lifegain, so aggro decks with small creatures are decent matchups
Furthermore, the alternative win conditions often require specific actions from your opponent
Custom Handmade Dual Lands (Old Frame) proxies made from real Magic the Gathering card with many different alternated arts available for purchase.
When I saw this card, I was reminded of Mirror Golem, which wants to imprint an artifact creature to give it protection from creatures and artifacts, but if not you'll just choose creature
None of them are quite powerful enough to just go in any old Cube no questions asked, but I could see all of them fitting into some niche Cube designs