Okay, look at it this way. You're fighting with a darkness death deck, and your opponent drops a fire shield. Oh crap. Many of your creatures die. As a result, they spawn skeletons. While you may not have seven creatures that die that turn, you can easily get seven skeletons from boneyards, meaning you'll never deck out, and your bonewall will never be destroyed.
Even if your opponent doesn't play a fire shield, in a darkness/death deck, you normally use parasites to spawn skeletons and grow vultures. In this way, by the time you're decking out, you probably have 4-6 parasites still on the field and swarms of skeletons, as well as a bonewall that'll keep you alive for quite some time. While some of your parasites are busy killing enemy creatures, you notice that you're going to lose in a few turns. As such, you start using parasites on your own skeletons. While the first 8 don't benefit you, the ninth skeleton on helps you stay alive. And much to your opponents chagrin, if he plays any non-quinted creatures you get six more skeletons to snack on. And you never have to discard either. You kill nine skeletons easily enough, and once the ninth one stays on top of your deck, you just play one skeleton so you don't have to discard. Next turn you draw your eights skeleton, and kill another skeleton, meaning you cycle between three skeletons and never lose. Heck, the first couple cards don't even have to be skeletons, they can be redundant shields, weapons, and eclipses.
But this combo requires at least 2 death quanta to keep up. One to poison and one to play. Then factor in the other uses of quanta, like poisoning other creatures your opponent plays, and you're spending 3-5 death quanta per turn. With an upkeep of 3 death quanta, suddenly you're spending 6-8 death quanta per turn, and in a duo deck, you might not have packed that many pillars.
In addition, an upkeep will dissuade people from playing two of these at a time, so a well times deflag means you death/darkness creatures will stay dead, if only for a turn. Seeing as this card could be considered a massive quintessence, so long as you have the boatload of quanta people do at the end of the game, I think an upkeep will help prevent it's abuse and help balance it, while it might still be very overpowered.
Pretty overpowered. I'd just use parasites on myself and never deck out. The card needs an upkeep.
How is it overpowered?As it only actives once per turn so that's only 1 creature that gets to return to the deck.
Like the idea but just wondering if creatures other than undead trigger it or should trigger it?
That's fair, but there are only four cards that can kill more than one undead per turn. Otherwise it takes a combo to defeat one card.