So in my scarab deck, with a bunch of time factories and a gravity mark, for a mere 2 quanta and all of my gravity quanta (no big loss), I can spit out double pillar production and play two pharaohs next turn. In my graboid-shrieker deck, with a time mark, for a mere 2 quanta, and all of my time quanta, I'm gong to start laying out shriekers as quickly as I draw them.
It's a situational card, and not really overpowered, but the only time I'd ever use it in a deck would be when I'm playing a deck where my mark is used to power something minor and isn't the primary element I'm playing with. All my mark quanta? No biggie.
First thing, in order to play them you'll have to draw them, wich, as you know, become more diffucult in a larger deck, since you will have to ADD them, so no "spitting"..
Second, playing a scarab deck and loosing all your gravity quanta IS a biggie loss, brò, since to start eating first can make the difference in wining or loosing a match as the deck itself it's fragile against fast rushes.
Third the card is not more situational than flooding, in fact, being quanta production related you may say it's instead a multiuse card, as quanta is the fuel of the game.
Fourth, the main purpose of the card is to help fueling trios and quads and as such(to go back to point 3) is situational like a supernova, but will you say that supernova is a bad card!?! Will you play a supernova in a mono? No, because it is stupid. Many decks exist just because of supernova exists and as such the game itself got a limitation in making rainbows works, but it's nothing compared to making a trio or a quad wich is way, way more difficult.
So you may have noticed that the mark quanta loss has been done to limitate the too big advantage on trios and quads this card may give, wich would have resulted in an OP card.