I'm having some success with this hot mess:
"Combo Soup"
4
Second Sunrise4
Faith's Reward1
Black Lotus4
Chromatic Star4
Kaleidostone1
Fastbond4
Savannah4
Scrubland4
Bayou2
Forest2
Swamp6
Plains2
Tendrils of Agony1
Demonic Tutor1
Ancestral Recall4
Squandered Resources4
Krark-Clan Ironworks1
Conjurer's Bauble4
Ichor Wellspring1
Skullclamp4
Enlightened Tutor1
Sol RingFirst you might see the
Second Sunrise and
Faith's Reward and assume that it's Eggs. But no! Then you see the
Squandered Resources and guess ProsBloom. Wrong again! It's actually a storm deck! The Eggy bits are just to draw some cards and cast enough spells for a lethal Tendrils, the reason being that it kills faster than
Prosperity/
Stroke of Genius or an
X-burn spell. Either of those would theoretically work, but I kept hitting the "No room in CD" limit.
This is, hands down, the most difficult and complicated deck I've ever played. I have no advice on when to mulligan. No lands, one land, and all land, probably, but beyond that is anyone's guess. What you'll be trying to do is cast
Squandered Resources into Sunrise/Reward with some combination of artifacts that draw cards, turn cards into mana, Sunrise/Reward, repeat, Tendrils.
If you don't have
Squandered Resources, make sure to put a stop on your upkeep if you're going to
Enlightened Tutor for it (now that I think of it,
Vampiric Tutor should be in here too). The
Skullclamp is for your
Pit Scorpion (you DID beat Pit Fighter, right?) but you can still throw it in the Ironworks for a profit if something unfortunate happened to it already. Don't forget to use a spare
Enlightened Tutor to find the appropriate artifact for the moment, if you already have
Squandered Resources out. Be careful you don't spend all your white mana (don't forget
Chromatic Star and
Kaleidostone can filter). If you double-click to cast or activate something with a
Squandered Resources out and it asks you to "choose a land" make sure you cancel as clicking a land will crash the game.
You will get run over by goblins, the Sunrise/Reward will be Counterspelled, and you'll lose on turn four to triple
Black Vise. Using the Archenemy card at the right time is important (you DO have an Archenemy card, right?); I prefer to use it either the turn before you get attacked for lethal (for obvious reasons) or the turn before you would otherwise go off- the reason being that some results do things that take a turn to be useful, such as put two lands into play tapped, or cause you to go off that turn, such as the one that Mana Flares.
I haven't beat the challenge yet but I think it's only a matter of time until I figure out how this thing works.