Just before I start, I'd like to say that I know there's already another Black Hole thread on the front page of this board, but it hasn't been posted on in two months and makes different arguments/suggestions than I will.
I'm going to make two main arguments here for why I believe Black Hole should be nerfed:
1. Strictly from a quanta and card cost standpoint, it is OP relative to what its effect is.
2. It has only one effective counter, which is a card that is not frequently used and is generally considered to be slightly UP.
Just a note: I am not claiming that Black Hole is at all OP when used against a mono, duo or even a trio; I am saying that it is OP when specifically used against rainbows, which makes it in a way a manifestation of elemental hate (while
is not an element, I consider it to be one in this context).
So now for argument 1: Black Hole is OP strictly from a quanta and card cost standpoint relative to its effect. I am no expert on valuing things, so feel free to correct me if I am wrong.
Let's assume that you are playing Black Hole against an opponent who is playing a rainbow, and that they have a couple of quantum towers out and roughly twenty-four quanta scattered across the twelve elements. When BH is used against rainbows this is probably the average situation in which it is used: either after a SN or a couple of turns of quantum generation from towers. In this situation, BH has two effects: it drains all 24 quanta from the opponent and heals the user for 24 HP. Let's break these two effects down and see (roughly) what they are worth.
Draining 24 quanta: There is no real benchmark for how expensive draining quanta should be, so I will use Nova, and assume that draining 12 quanta is worth a card. In that case, draining 24 quanta should be worth two cards.
Healing 24 HP: I'll use the Heal card here, as 20 HP is almost the same as 24 HP. Therefore healing 24 quanta is worth 3 quanta and a card.
So all in all, BH costs 4 quanta + a card, and is worth 3 quanta + 3 cards. Assuming one quantum roughly equals a card, BH is then worth one more quanta than it costs. This is in an averagish situation when used against a rainbow; if BH is used lategame and drains 36 quanta then it is worth roughly 5 quanta + 5 cards. This valuation leads me to my first nerfing suggestion: increase the cost of BH by one, both unupped and upped, to 5 | 4. My second suggestion is to have BH heal one HP for each two quantum drained, which would balance this calculation.
Now for my second argument: that BH lacks effective counters.
BH is a spell, so obviously neither PC or CC can counter it. Secondly it is a non-targeted spell, so it cannot be countered by reflective shields. The only counter that exists to BH is Sanctuary, which is a hard counter. This is fine, except Sancs are a terrible card to include in a rainbow, where the issue lies.
So here is the conclusion I have come to: BH is roughly one quantum cheaper than it should be when played against rainbows, and there is no effective, practical way to counter it if you are playing a rainbow.
I know that rainbows are generally viewed unfavorably here as being generally OP, and that indirectly buffing them by nerfing their main "counter" is not likely to be popular, but I ask you to at least consider what I am saying. After the SN nerf, is it not unreasonable to think that BH should get one as well? Please don't just dismiss me as another noob who wants his speedbow to be more effective.