Compare with miracle: min 15 cost unupped
Fade:
min: cost = 2, 1 discard; heal = 15
max: cost = 2, 7 discard; heal = 105
At 7 cards, the effect is 1 hp greater than miracle in absence of total hp gaining cards. Therefore, we need to ask if 15+ quanta is a similar (or slightly greater, given miracle's added life gain utility) cost to fade. In other words, is the opportunity cost of 7 random cards equal to 13+ quanta. IMO it is not. If you are stalling, most likely you will have a larger hand than if you are rushing. These cards would have some added benefit, which would be greater than approx. 2 quanta/card in most stalls imo, especially since in absence of denial, quanta become more plentiful late game. ...but fade can be used in absence of a pure stall! Let's consider using this in a deck that tends to empty its hand quickly then. At 2 cards (including fade) in hand, compare to heal: 2
+ discard for 15 hp < 3
for 20 hp. At 2 cards, 2
+ 2 discard for 30 hp < 3
for 20 hp imo. The opportunity cost of losing your hand is not worth the quanta saved imo.
I admit, it's a wickedly cool mechanic, and props for the idea. I don't think the utility is there though.