i've had a game just now where my opponent filled my hand with the card-drawing shard. this resulted me in having 8 cards in hand and 0 cards in the deck.
now, even though i was unable to draw a card at this point, because my hand was already full, i still lost the game due to having no card in the deck, which seems wrong in my eyes.
Edit: to clarify, i lost the game at the beginning of my turn. not during the playing of the shard.