Somebody is more than welcome to steal my idea here, since I'm not going to enter (if i change my mind I'll think something else up) but I was thinking a card that could help find other cards in your deck would be very nice to have. Something along the lines of this:
"Look at the top five cards of your deck, and put one into your hand. The opponent looks at the remaining four and puts one into their hand. Discard the unchosen cards. If your mark is Aether, look at six cards instead of five." (the card would kill you if you had too few cards in your deck to look at, like drawing with hourglass at 0 cards)
(unupgraded the opponent would get the first choice out of the five or six cards, and you would get second choice)
-could cost maybe 6 or 7 other quanta to play