in my opinion there are 2 choices:
-> it is a entropy permanent and every turn shufle the deck of both player's(maybe also they're hands) every single round
this have no upweek and it is suposed to be combined with eternety or something that would completly confuse the oponent so as you...lol
-> it is a wind card and it shufle both hand's and decks when it is used (cost like:
)(unuped version) and in the uped version it is only your hand by same cost
this one is to be used when you draw the wrong card but is higly expensive to use ability once it can counter nightfall,help fractal when you dont want the card or have to less cards or is stacked...
is a realy good card but it would have a high cost (just like mindgate) in order not to be overpowered