The front side, Avatar Aang, is a value engine
Notably, this card does not stop reanimation or other means of cheating things into play without casting them
While the MSRP of that product was set at about $120, this promo card will get you over $20 back alone, not to mention the 16 booster packs included, which make up the rest of the cost
Then put all cards exiled this way that werent cast on the bottom of your library in a random order. (This is the only part of the interaction that is affected by the rules change.) So with Cascade, this means that the combined converted mana costs of both halves of the card need to be less than the CMC of the spell thats the source of the Cascade trigger
And a few artifacts as well: Round it all out with a couple of special lands, and youve got a lot to play with in Prismari Performance
In addition, Ali from cairo was finally deemed not that good, and someone regained his sanity regarding sword of the ages