By that I mean that Rainbow DK hearkens back to yesteryear, when classes didn’t get parasitic packages dumped on them all in one expansion set, that dominated that class’ playstyles for the much of, or the entirety of a standard rotation.
Examples of parasitic packages include:
- Naga Priest from Sunken City
- Curselock from Sunken City
- Relic DH from Nathria
- arguably Aggro DH from Nathria
- Wildseeds Hunter from Nathria (debatable, this was a cornerstone in Renathal-Denathrius minion pile Big Beast Hunter)
- Skeleton Mage from Nathria
- Implock from Nathria
- Enrage Warrior from Nathria
- Arcane Hunter from MotLK
- Undead Priest from MotLK
- Concoctions Rogue from MotLK
- Undead (Chaddius) Warlock from MotLK
- Deathrattle DK from FoL (never took off but I’m counting it)
- Outcast/Rush DH from FoL
- Hero Power Druid from FoL
- Overheal Priest from FoL (sort of)
- Self-Harm Warlock from FoL
- Plague DK from TITANS
- Rainbow Mage from TITANS
- Earthen Paladin from TITANS
- Mech Rogue from TITANS (sort of)
- Control Warrior from TITANS (I’m counting this, the class got supercharged all at once in this set)
- Naga DH from Badlands
- Dragon Druid from Badlands
- Elemental Shaman from Badlands
- Sludge Warlock from Badlands
- all the Excavate decks from Badlands
- all the Highlander decks from Badlands (sort of)
By “parasitic packages” I mean, the strategies and the payoffs are all plainly apparent within the same set, and once those sets get rotated or powercrept, the class needs to be reinvented from the ground up. Look at Control Warrior before and after TITANS - what happens when TITANS rotates? Look at DH right now - ever since Relics and Outcast got powercrept out of the meta, the class had been worthless through FoL miniset and TITANS until it got Naga DH in Badlands (itself a parasitic package), and slow/Highlander DH is still abandoned.
Get a load of Warlock. The class is stapled together by parasitic packages. Same for Mage and, to a similar extent, Rogue.
On the other hand, Rainbow DK has been a slow churn ever since we got Climactic Necrotic Explosion in FoL, and it was clearly just a meme for that set. Remember when Sickly Grimewalker came out in TITANS and it was hot garbage?
But then, they printed Maw and Paw, Crop Rotation, Quartzite Crusher, and Mining Casualties in Badlands, alongside a buff to Corpse Bride. Over the course of the year, Rainbow DK has been coming together, and it’s only getting better. Sure, when CNE rotates, that humongous payoff will be gone, but single cards are easily replaced, and in many games you don’t even need it. The whole “Rainbow” package won’t rotate out at once.
The deck seems extremely wholesome to me because Rainbow DK both lacks a parasitic core package, and the gameplay is devoid of mana cheating or random generation (outside of Corpse Farm, which can summon an 8-drop for 3 mana, but right now I see lists only with Malignant Horror). I hope that in the upcoming Standard Year, especially with existing Highlander decks, we see new cards that are simply good on their own, or become good in association with new sets, and not cards that have to be part of a package that occupies half your deck.