Oh my gadz! First turn 84% of the time*? OVERPOWERED! NERF! IMBA! LEAFBLOWER! METAGAME!
Newsflash: you're an idiot.
Those 2 characters are well into the 300's total points cost. With raiders and dark lances more expensive than ever, that really hurts. Besides, not playing like a retard is all it takes to beat this sort of list anyways. Even moreso than IG. All the same tactics that destroy the "famed" leafblower style lists hurt DE even more. At least IG are AV12+, not open-topped, and can have cheap bubblewrap units.
Q: What do DE players do when they play this list and their opponents full reserve or use deepstriking units?
A: Start packing up.**
* - With Sathonyx and Vect.
36 possible outcomes
5*(21/36) = 2.91666 more wins from first 5 draws
1*(21/36) = .58333 more wins from 1 remaining draw
= 3.5 more wins from all draws
= 24.5 total wins out of 36 possible die outcomes
24.5/36 = .680556 chance to win initial roll-off
[1-(24.5/36)] X (3/6) = .159722 additional first turns from siezed initiative
.680556 + .159722 = .840278 => 84% total chance to go first
** - That being said, it will completely decimate everyone anyways. If the internet has shown us anything about 40k gamers, it's that they don't like thinking tactically and so this list will rock them all***. It will be the 4-move checkmate of 40k. Prepare for the FAQ to nerf this combination for no reason other than because general(ly wrong) consensus makes it out to be unfair.
*** - Now that I think of it, maybe if I play a list like this, it will create a new metagame in my area where everyone tries to play more tactically in order to win. Perhaps that is what Darkwynn was trying to do all along...