As far as i can see its already balanced though, considering how RT is in a way exactly the same as destroying a creature anyway this shouldnt be considered OP, I hardly even see what the problem in that kind of deck is anyway, It wouldn't be powerful as it would no doubt have very little manpower to support even with the control, and anyway, many of the cards (like this one) would give advantages for later to your opponent.
As i said it doesnt seem OP right now, so your solution would make it UP probably, especially since that would eliminate one of its key uses, furthermore it doesn't fit thematically.
Im not down refusing to say its OP, I merely want a more reasonable argument then this.
1. RT does not help me when my objective is to "kill every creature in your deck." As long as the opponent has quanta, he can summon one creature per turn, and his damage potential would never drop to zero.
2. Something you completely disregard when judging the power of "that kind of deck" is card advantage. Unless your deck is quanta heavy, me increasing your quanta production through the use of Reverse Summon would not help you in any way, since you have no cards to use that quanta for. In addition, most creatures (at least those with more than 5 HP) expect to be able to survive at least one CC spell. However, this card 100% destroys any creature, regardless of HP. With 6 of these in a deck, you are quite realistically negating 6 non-immaterial creatures in the opponent's deck.
3. There is a blurred line between "balanced" and "UP." Making it work one turn later doesn't make it UP, especially when it's a mechanic like this.
4. Eliminate a key use? One of its key uses is as CC. With my mod, it'd still do that. Another key use is to gain quanta. With my mod, it'd be even easier to gain quanta since you can just buff the creature before it dies and don't have to use it in a fate-egg rainbow.
5. Doesn't fit thematically? How is setting a creature's HP to zero less related to entropy or reverse summoning than outright killing a creature?
If you add "and owner draws one card" then it would match the concept better.
Right now, a cheap insta-kill card is not my favorite thing to add to this game.
that would make this horribly under powered
Maybe instead of the quanta gain the owner draws? thoughts?
It's already horribly overpowered, and even if the opponent draws it would still be overpowered. How did you figure that giving the opponent +1 card advantage would make it go from balanced to "horribly under powered"? Wouldn't you need to assume card advantage is important, and concede that this card is OP because it completely ignores card advantage?