Well I recently started playing Dagon instead of Eredin, reason being that Eredin is almost forced to run Crones for deck thinning, while Dagon builds can simply run Foglets. I netdecked this:
http://www.gwentdb.com/decks/24617-weat ... -rekt-meta almost entirely, albeit skipping Geralt: Igni which I don't have for Succubus / Imlerith. The deck is indeed not easy to play. Still, even accounting for that I'm not convinced Dagon is better. For reference I take standard Eredin decklist as:
http://www.gwentdb.com/decks/25623-4250 ... with-75-wrPoints:
1) I like frost better than fog. Frost will actually kill its targets, while fog does not and allows stuff like Knight-Elect to keep generating value. Further, fog weakens my BTM / Succu / Fiend / Scorch etc while frost does not. A last advantage of frost is that it triggers Imlerith.
2) Eredin's bronze cards are actually quite good. He's got more carryover, and more ways to generate immediate tempo. This also means he can make generic plays that still advance his board (EE / Harpy / Thunderbolt Potion), while Dagon runs out of these much faster and has to show his cards.
3) Dagon builds spawn so many units that anti-swarm cards are scary. Eredin also spawns a lot of units, but comparatively much fewer. Cards like Lacerate and Dol Blathanna Trapper are insane against Dagon, still good but less insane against Eredin.
4) Eredin can kill a unit a lot easier than Dagon can. He's not only got the natural advantage of fog, Imlerith does 8 damage, and if necessary Wild Hunt Warrior also does 3.
5) Finally Eredin is more versatile. If round 3 is gearing up to be a short one, Eredin easily generates more power than Dagon (although truth be told, by round 3, Dagon really should already have been played). If there's nothing else to play, he can also spawn a rider especially if he won round 1.
Dagon has some advantages, in particular Woodland Spirit is great, Ge'els is operating at full effectiveness (although having a lot more different silver cards has its consistency drawbacks, too) and for me at least, it's so much easier to get the Foglets out of your deck than the crones. It's also possible the Dagon build has slightly suboptimal cards. I particularly dislike the Alzur's Double Cross, which is actually counter-productive if it pulls Frightener.
I'll fiddle a bit more with Dagon. What list are you running Sjokwaave? Preliminary thoughts on some of the possible silvers -
Aeromancy - together with a silver weather card could be viable. It matches the deck thinning effect of ADC, and it's another way to access fog if really needed.
Commander's Horn - problem is everything is one power or two power and this could actually make Scorch / Geralt: Igni even more powerful. I almost got blown out by G:Igni targeting my 2-power units in one game, this would make it worse. Conceivably it's possible if convoluted (requires Woodland Spirit / Fire Elemental, and then only on the melee row) to use this on a mix of 1- and 2-power units however.
Iris - Dagon spawns so many units she could be insane, although Dagon also has less carryover.
Katakan - poor man's Caretaker?
Olgierd - since less carryover than Eredin?