So, just thought I'd share this even Feln list. Note: no waxing moon, though maybe enterprising individuals might find a way to squeeze 4 moon and 4 black-sky harbinger into here.
Anyway, while I don't *think* most card choices need much of an explanation, let's go down the list anyway.
Annihilate: either this or defile depending on your preferences, if you're more scared of time fatties, or...Champion of Chaos in particular. Stock cheap spot removal.
Evenhanded golem: duh. Next.
Exploit: another case of duh. Try not to let this be your first play, since you want to commit to the board ASAP.
Grenahen: golems 5-8. Much better body, can even draw spot removal vs. aggro decks, but you need a lot of hits for it to feel good.
Jarrall Ascending: maybe a bit controversial of a choice, but good body, draws spells, and if you ever spellcraft timepiece, he domes the opponent for 24. He's also a 2-drop that draws more cards.
Plunk Wumpkin: we're here to draw cards with 2-drops. See a pattern here? This is a 2-drop that draws more cards. Obviously overloaded card is obviously overloaded. Play the full set.
Saloon Massacre: flexible sweeper to smack all those aggro and aggressive midrange decks. Better have it and not need it than need it and not have it, as they say.
Stormblast: a couple of these for grenahen hits and to negate various spells like
Nothing Remains out of even Argenport.
Vicious Overgrowth: hits sites, hits cheap multifaction units, and is a grenahen hit. Can also be amplified when Jarrall is at 8 for more face damage. Not a particularly great card, but spells that do damage increase both hen and Jarrall hits.
Vine Grafter: really good even merchant is really good. Blocks aggro (autotread notwithstanding), and gives regen to Champion of Cunning. Probably better than a lot of regular merchants too.
Iadria, Twisted Brewer: LightsOutAce and TheBoxer don't like her. I shaved her from 4 to 2 in the latest iteration, but she does some nifty things and makes both attacks and blocks much better.
Helio, the Skywinder: better in numbers. The first one (for 3-4) is good. The subsequent ones are nuts. Obviously, play the cards you have before trying to draw more, as she's fairly tempo inefficient.
Pale Rider's Timepiece: yes, this is playable in a Helio deck. Sylscar decks ran 4 en route to winning the last throne ECQ, and since Icaria First Reaper is now a 7-drop, this card fills in nicely, and is easier on the influence.
Serpent Hive: power you can fetch with Grenahen! Also, blows up
Thudrock's Masterwork. Run at least 3 if not the full set.
Power base: pretty straightforward. Bunch of duals, cobalt waystones (OPOP), and one primal sigil in case a stray ice bolt comes flying.
Market:
Last Chance because there's no recursion maindeck, so this gets you another shot at CoCu or Silverblade Menace.
Edict of Makkar: more cheap removal, namely for Rolant, but other time fatsos also qualify.
Burglarize: the only relic interaction that you can fetch with vine grafter. It's obscenely overcosted but what can you do...
Silverblade Menace: fairly low opportunity cost way to get a bit of non-negligible damage in, or in a particularly long game, to get a substantial chunk of it.
Champion of Cunning: is still being buffed after 12 sets. One of the most frightening cards in the game once he gets +1/+1 and regen.