too much underpowered precognition, too much similar to precognition
also what happen if i play 3-4 copies in the same turn? the next turn, other than not draw my normal card, i can't draw with hourglass?
this paired with precognition can shorten the deck by 12 cards, which can be cool for some pvp otk decks, even if u probably have no room for this
the nightmare part is too situational, the only cool part is being able to win a 30 vs 30 cards match by deckout rather than lose, but still eternity exist for this and it is a lot more reliable