Universes Beyond Final Fantasy marks the first time we have ever seen Saga Creatures in Magic
Positive auras in most colors suck
TLDR Magic: The Baseballing Secret Lair is a baseball card style Secret Lair drop that turns the original five planeswalkers into collectible sports-card-looking, reversible cards
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
There aren't actually any rulings about how the player must perform the shuffle, meaning that they could theoretically conceal their shuffling completely and turn your opponent's blocking into a complete guessing game as opposed to trying to follow the shuffle around which might have been the intention of the card
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