This card was given out to those who participated in the 20th Anniversary Festa at Toki, Messa, Niigata
Attaching the photo boxes together
Of course, this means you need a character on board that can initiate the challenge before Maid Marian gets value, but there are 11 4-cost characters that all have decent Strength values, so it isn't hard to get something down the previous turn that can take the Challenge
Its easy to be on the back foot, where having them is really bad, and while there is Negate and Bone to Ash the lack of something like Essence Scatter means that sometimes your opponent can just play around your situational countermagic until they can find opportunities to pay for them and they stop working
You can still play only one land per turn, and only during your main phase when you have priority and the stack is empty