The interaction between Lion’s Eye Diamond and what seems to be the “logic” of the client is entirely off. The client makes the assumption that the player would never want to discard their hand, and therefore doesn’t recognize that the ability to activate the card’s ability exists in situations like paying additional costs (things like Mana Leak, Daze, Spell Pierce, etc) nor does it recognize that there may be an advantage to discarding your hand (Echo of Eons). This can be fixed by the client recognizing the ability as an activated ability rather than a mana ability (text on the card specifies it can only be activated at instant speed)