Problem with increasing maximum handsize is that the game itself only looks right and functions at 7 cards in hand. I don't think the way the game is currently arranged and programmed that you can have more than that.
Perhaps an item that just says: when players are forced to draw cards above their maximum hand size, they must put that many cards from their deck into their graveyard. (And for each card they can't, they take 1 damage).
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