Wait, wrong dream. My dream is just that DKs don't suck. And they don't, so that's mostly realized, but they could be better. A lot of that involves other classes, so I'll just touch on some quality of life changes I'd like to see and how they'd affect gameplay, then I'm curious to see what you guys think of 'em.
My first one is Death Coil healing on a percentage of total health instead of as a multiplier. Maybe... 5%? Three Lichbornes and three Death Strikes would heal for 36% in 6GCDs. 7% wouldn't be untoward, either. That'd be an extra Death Strike, which would actually work quite well. I don't think this would change much in a PvE setting, but the heals we're getting now are pretty crap. I think I actually managed to crit for 46K once, which was promptly AA'd down by a cooldowning warrior with one mighty flex of his thews.
Anti-Magic Zone should, in my opinion, be placeable as an AoE silence a la Sunbeam, but also reduce magical damage taken by 75% up to the DK's max health for all allies standing in it. Lasts 12s. This would make AMS a reasonable pick for tanking, allow a distant silence that doesn't require a rune, and give us some choice between AMZ and Lichborne.
Death Siphon needs another buff. It sucks. I'd say another 50%, maybe 100% damage buff if you're feeling ambitious. This would affect exactly nothing in PvE because nobody ever takes it. If it gets buffed to, say, double it's current strength, it'd heal for about 30K per use of a Death Rune if I recall correctly.
Desecrated Ground needs a mighty improvement. If it lasted 4s and made it so your allies couldn't be CC'd while they stood on it, I think that'd be great. I also would enjoy it if it gave you some sort of passive defense, like 25% less damage taken. This would make it an attractive tank talent, since currently all the options kinda suck except RW which is useful for trash.
Chilblains, Death's Advance, and Asphyxiate an unpleasant set of choices. I'd rather give Deaths Advance to Unholy DKs baseline and swap that out for Desecration, then make Asphyxiate function as both a stun and a silence but only DR for stuns. That'd give us some real choices to make without affecting PvE too much. I'd still stick with Asphyxiate as a tank, but a choice between Chilblains and Desecration would be nice.
Remorseless Winter could stand to take a buff. Instead of decreasing the cast timer on it, though, I'd rather make it so that it makes you deal 2.5% more damage per stack of Winter that you have on a target and a base 10% extra damage when activated. This could well get out of hand in AoE fights in PvE - 10 mobs with four stacks of RW already grant you 40% extra damage. On the other hand, in boss fights it'll see less stacks, but it'll still give you the flat 10% damage buff. This would also lend it some use outside of just forcing escape and non-damage/ healing GCDs, since that's kind of mediocre for an end-tier talent anyways.
Soul Reaper needs some sort of additional caveat. Now, if I got my way, it'd rip part of your target's soul clean out and it would have 10% of the target's health while dealing some modicum of damage (perhaps 33% of your weapon damage as Shadowfrost, unaffected by masteries) per hit every second until the debuff expires. If they're below 35%, then it deals the additional damage. If not, then at least you did something cool. I'd also like the timer to be nerfed to 3s, which would be easier to time, but that's just me being whiny, bad, and lazy. It's possible to do as is, just a bit of a chore. I don't see this affecting PvE so much except to possibly lag some people with the amount of ghosts spawning.
The overall gist of the talent changes I'm suggesting would be so you could choose to further become a damage machine or if you want to become beefier and tougher. They're largely PvP oriented, but some of them are pretty useful for PvE, too. Please leave comments and questions, I'm interested to see what other people think!