It's an aura that gives creatures different stats and a few various keywords
Divination reads that During your turn, whenever you draw a card, you may move 1 damage counter from chosen character to chosen opposing character, which in itself is a powerful opportunity to decrease damage, and either on the card itself or on others, and equally place this on other characters, rather than having to use up your opportunity to quest to do so, is powerful
Don't feel like attacking
As for the actual break-down, it goes as follows
They're also cumulative with other effects that let you play additional lands, such as the one from Urban Evolution
Wincons outside of typical black combo pieces, especially the Revel in Riches and Marionette Master pieces to take advantage of those Treasures, are a bit lacking in Mari's supported creature types