You have no maximum hand size. If an effect causes you to discard a card, discard it, but you may put it on top of your library instead of into your graveyard.
If you wish to make a return, please shop within 48 hours of receiving your order. Requests will be evaluated on a case-by-case basis; items submitted without a preauthorized return, may or may not be refunded.
Once a return is authorized, please pack it safely and send it back. For valuable cards/products, we recommend getting a tracking number and insurance to ensure your package makes it safely back to us.