Morphs returned to hand
Playing KtK draft. Opponent casts Dutiful Return and brings 2 morph creatures back to their hand. Both creatures are visible to me and have the eye symbol. As mana is tapping for OP, both creatures in OP's hand are no longer visible to me. OP casts 1 morph creature. Next turn, OP casts another morph creature. Should the visible creatures in OP's hand have disappeared for me considering only 1 of the creatures was cast?
I understand the mystery of morph creatures and that having constant visual of known cards in hand would spoil that mystery. However, Arena has conditioned us that known cards in hand remain known until shuffled into library.
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[Deleted User] commented
Since the card is being played face down, you do not know which morph creature has been played. So you also don't know, which morph creature remained in the hand. Thus you now do not know with 100% certainty, what card is in the opponent's hand. So you do not get to see it anymore.