Dunno, @TinyDragon played a mean Clops BG not to long ago and rolled with it. It would require a few shards, but was definitely potent. I would say easily tops the voil...
Staff of solstice is also up there for me. Or paper wings for after. You play steel wings to give them flying again.
And what do you recommend to pick/avoid in units, spells and relics? Personally, i see a viable option of using Defend the Roost as a life saver along with Moga Bartering Post near the Shrine to give regen+magical resist acting as pseudo heal. Well of course its idea on paper, but pretty useful, i think...
i was also trying it out, but i found that its kinda iffy to defend the roost a dieing chanp if you dont have good heal, bartering post is an ok idea, but more ideal would be a champ with better healing capabilities, which voil dont really have in theme. you can also use defend the roost on less needed champs like the pet so you get 2 extra summons and the 2 dmg from surge and the hp. But im not sure if its worth the 2x. try it out and tell me how it goes. if it gave regen 3 it would be better, but regen 2 is a quite a bit slower. if you put regen 2 on the champ, thats 25 nora for the relic, plus the defend the roost, plus the 4 nora for the train regen for like 60 nora in all just to slowley heal your champ back up, and get 2 summons. at that much nora you migh at well play another champ and let the other one die and hopfully get the nora globe. remember sp gets par of its bonus from champs dieing, so we kinda just want a steady stream of champs over saving almost dead ones, and not getting another champ out.
I think Devour might be a good option then. Well, there is simply too many situations where it can be used on almost dead champ while you still need a heal for others. Also i think Intimidation with some Voil King Krypts(that is basically 2 units for one rune, and that units can even been multiplied when using as a finisher) is a pretty good option when you have lot of bats and your opponent have fewer but stronger units.
Sorry I didnt respond for awhile my monitor broke anyway here is a budget Voil deck. x2 Firebomber x2 Voil Bomber x2 Voil Sorcerer x1 Lance Admiral Sceian x1 Voil Guards x1 Voil Jester x2 Voil Stormflyer x1 Voil Imperialist x2 Voil Frenzy x2 Voil Queen x2 Voil Windstriker x1 Wings of Steal x2 Peak Tactics x1 Alacrity x1 Nublins Surprise Pies x2 Rip x1 Vertical Push x2 Voil Caverns x1 Voil Kings Crypt x1 Warbanner