@Dm:
Fair point. However, I would argue that very often PC, and occasionally CC, can make decks faster. Like i said, if your opponent has a Dim Shield up, would you rather have a frog in your hand or an explosion? If they have Poseidon and are about to destroy your pends and kill your quanta, I'll take a steal over an Elite Mummy. Likewise, if my opponent drops an Amber Nymph onto the board, I'd better hope I have some CC handy. If they play an Elite Oty and I've got a frog and a recluse on the board, I'm in big trouble if I don't have a thunderbolt in my hand. Some CC and PC in a rush deck can speed it up by removing obstacles that get in the way of a deck's success.
Secondly, rainbows are a large enough part of the meta that Black Hole is a worthwhile card, just like decks that depend on permanents are common enough that PC is worthwhile. Also, if a combo is OP, there are two ways to deal with it; nerf one of the cards or nerf the other. Discord has already been nerfed, and disco-BH is still OP; any idea what I'm going to say now? The difference in number of counters is not the only thing that makes BH powerful. Sure, there are only two says to counter spell damage, but since the quanta cap, literally nobody builds decks around bolts. Secondly, if you want to counter damage to creatures: Plate Armour, Blessing, CP, Burrow, Anubis, Silence, etc. I could list more if I wanted.
The first is false. One, because you TOLD us that "The deck size should be made to maximize the damage dealt." PC and CC DO NOT Maximize Damage Dealt (Most decks don't have anything worth PC-while; don't argue with this, because if you do, you are telling me most decks have something worth PC'ing, which is the same as telling me SNova's are not a dominating part of the metagame and we'll fall on Rush>Stall>C>Rush that I've said before.) CC (CREATURE control) clearly does not maximize damage dealt. In very specific cases, PC can be used to help you (DimShields or Wings), but CC will never maximize your damage dealt as the creatures are fairly meaningless to what you are doing at the moment (maximizing speed). PC is situational, which means it does not maximize and often slows. Sorry.
As for Poseidon, not only is EQ more worthwhile, but in a SNova you already got the quanta you needed if you have enough to choose between an elite mummy and an Explosion. Your Pends don't mean much right there.
Amber Nymph is a rare card that requires two turns to drain you, and you have already used most of your quanta (We HAVE argued about this already and you never continued, which is, I assume, an agreement; refer to Page 3.) by the time it is dropped, since it has a heavy cost. You already have creatures on table when Amber Nymph is dropped, the heal it will give won't slow you down for any further than one or two turns (that most likely won't make a difference if you are facing an Amber Nymph.) Further on, if you drop the Elite Mummy, you are dealing damage to the opponent and killing him faster, while with CC, the killing of the Otyugh or of the Amber Nymph does not speed up the rate at which your deck deals damage. CC or PC does not Speed Up the deck; it makes it so the deck isn't Slowed down IF, IF IF IF, (We argued about this as well!) you're facing Control. And as Rushes are usually dominating (we talked 'bout it..!)
It is common knowledge to anyone that plays PVP2 on a decent rate that the only reason BH would be popular is because of the constant use of SoFo. Even before the SuperNova nerf, I would rarely see the BH's around- and when they were around, they were in Rainbows themselves. I -HEAVILY- Disagree that PC is an important part, as in an upgraded meta game (which we are assuming), the Permanents don't bother you all that much unless you're in the unlikely scenario of facing an OTK -- A scenario that seems to have died out ever since the Instosis nerf in 1.32.
Discord + BlackHole is only OP in the first few turns. Decks are often unaffected by discord in the later turns, since as the match progresses, the fact that you will be generating more and more quanta is easy to notice, and you will easily bypass what Discord is doing (Scramble). With each turn, the amount of Quanta the Discord Scrambles will be the same, but you are producing more, until the scramble is meaningless -- if the opponent constantly uses BH, it will run out of BH's soon and it won't heal enough from just a 9 scrambled quanta that the Discord gave. By some Smart Play you can outsmart the BH usage and do an splendid comeback.
"Literally no one" is not a valid point. "Literally anyone can place a Sanctuary in their decks and counter BH". There, I used your logic and said the same thing in reverse. According to you, it holds true. Bolt STILL kills 100 HP opponents, and if you think FireStall isn't as great as it was before, I'd like you to check the card Fahrenheit. For your "countering damage to creatures", I'm sorry, that would be quite false. You're not countering, you're delaying the inevitable. Countering would be to nullify, in our current scenario -- what you are saying would not be countering, it would be finding a way to survive longer.
PS: "Literally no one" uses Plate Armor/Anubis. :3