Post here your screenies and say what challenge it was.
Just in case, also post the decks you used.
PLEASE USE SPOILERS
What we got:
Worth 1 pt
Upgrades are for noobs: Beat Demigod with unupped deck. Colosseum predictions allowed. SENT TO SHINKI

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(http://i.imgur.com/YKgUpV4.jpg)
(http://i57.tinypic.com/2yvnpmf.jpg)
Playboy: Win the game with every nymph on your field SENT TO SHINKI

0250002568034sa0950u04kvj03kvl06l9e025rg01lro026ug0274o027h8027qu018pl
(http://i.imgur.com/HSR6C9c.jpg)
(http://i62.tinypic.com/21mw9kl.jpg)
Commoner: Beat a Champion with only Common/Uncommon cards. Upgrades allowed. SENT TO SHINKI

0861o0863a02m1r06m1v0680d018pu
(http://i.imgur.com/BClFF4e.jpg)
(http://i62.tinypic.com/14t34p0.jpg)
I cri every tiem: Win with 6 NT in hand SENT TO SHINKI

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(http://i.imgur.com/3JWHeZe.jpg)
(http://i59.tinypic.com/1iztvs.jpg)
NEVER GONNA GIIIIIIIIIIIVE YOU UP: Rickroll a GO that's not in your guild or make them think a link is a Rick Roll. Screenie must include GO admitting the Rick Roll. SENT TO SHINKI
(http://i.imgur.com/GxSMt3Y.jpg)
(http://i59.tinypic.com/2qum3wh.png)
Pillars? What?: Win without any pillars on your field. SENT TO SHINKI

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(http://i.imgur.com/eZ1K7vA.jpg)
(http://i58.tinypic.com/11gtu35.jpg)
Worth 3 pts
Absolutely Flawless: Win a game against a Champion with full HP (Take screenie of your LAST TURN) SENT TO SHINKI

0e4vc0250u064vf025lj046u7027k2018pq
(http://i.imgur.com/Og4LphM.jpg)
(http://i62.tinypic.com/vzhiex.jpg)
Screw the rules, I have cats: Win the game with cats as the only creatures in your deck. (Byakko is a cat) SENT TO SHINKI

0e50u04kvg06kvn02lm3047kj027k2018pq
(http://i.imgur.com/Pw7TFzG.jpg)
(http://i58.tinypic.com/hx6y6o.jpg)
Believe it: Win with the Wet Dream Bow against A CHAMPION. WDB: Any deck found in kirby's thread. Must be legal. SENT TO SHINKI

05ksg034vc0550u03kvu03lin02ls103lv102m2g02m220274q01n4q01n470274b01n4b018ps
(http://i.imgur.com/1ubRDfO.jpg)
(http://i62.tinypic.com/10diezd.png)
The Power of One: Beat a Mage with your deck containing at most one copy of every card besides pillars and pendulums. SENT TO SHINKI

075rg075t201lrp01lrr01ls501ls701lse01lrk01lrl01ls101lrj01lrn01nq2017q8017qe017qk01nqc017q6018ps
(http://i.imgur.com/W6tm0kg.jpg)
(http://i60.tinypic.com/2ic4arn.jpg)
Worth 5 pts
Weapon Master: Win a game with 24 different elemental weapons out. SENT TO SHINKI
(http://i57.tinypic.com/64gt4m.png)
We are assuming the weapons are in-element for this screenshot

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CardsR4Noobs: Win a game without using any creatures or spells. SENT TO SHINKI

0k57603lf7065jm0d5t206lrl0574k01n4k067e2018po
(http://i.imgur.com/FIgdFSQ.jpg)
(http://i59.tinypic.com/ot3ktk.jpg)
Beginner: Beat a Champion with a starter deck and the free packs. SENT TO SHINKI

084sc084tg014sg024vk024vu0155q0155t0255m035ri015s7015rk015rl015s6015ru0261r018ps
(http://i.imgur.com/qmtk2GQ.jpg)
(http://i61.tinypic.com/317fcc6.jpg)
Streaker: Go on a streak of 20 against Mages
240BLAZEIT: Win with exactly 240 max HP and with a Fire Bolt. Take a screenshot of the final turn. SENT TO SHINKI

01622084sa0650u034vn014vf0255n0155o035fi015f4025f5045m6015rl015rm066u3018po
(http://i.imgur.com/fzYaE5b.jpg)
(http://i57.tinypic.com/2ltdhh.jpg)
RNJesus Hath Blest Thou: Win a game with 1 HP remaining and a Fog Shield out SENT TO SHINKI

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(http://i.imgur.com/1rI8dKn.jpg)
(http://i59.tinypic.com/zikbba.jpg)
immortals + SoW + a lot of patience should work for 'streaker'.
We have a good advantage on 'weapon master' with upped fluxor, purple nymph and eternity to give flexibility
CardsR4noobs (EM XD)

0k57603lf7065jm0d5t206lrl0574k01n4k067e2018po
(http://i.imgur.com/FIgdFSQ.jpg)
EM Champion
(http://i.imgur.com/Og4LphM.jpg)

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EDIT: now with less than 20% upgrades. stupid rule
RNJesus

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100HP + frog + LS + 2 SoSacs = lol
(http://i.imgur.com/1rI8dKn.jpg)
Chap's fix of EM Champion

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(http://i.imgur.com/Og4LphM.jpg)
Fix of the cat screenie

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Byako is the only decent cat hitter ;)
(http://i.imgur.com/Pw7TFzG.jpg)
commoner

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(http://i.imgur.com/BClFF4e.jpg)
power of one

075rg075t201lrp01lrr01ls501ls701lse01lrk01lrl01ls101lrj01lrn01nq2017q8017qe017qk01nqc017q6018ps
(http://i.imgur.com/W6tm0kg.jpg)
pillars? what?

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Note that it says no pillars in your field instead of deck. No rules against blowing them up once you are done ;)
(http://i.imgur.com/eZ1K7vA.jpg)
i cri evry tiem

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(http://i.imgur.com/3JWHeZe.jpg)
I'll take a break now :P
Playboy (this would be easier if ressonator hadn't been nerfed)

0250002568034sa0950u04kvj03kvl06l9e025rg01lro026ug0274o027h8027qu018pl
(http://i.imgur.com/HSR6C9c.jpg)
Beginner

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which is the 3rd :time starter deck
(http://i.imgur.com/qmtk2GQ.jpg)
Sorry Shinki, but when I tried to use tinypic all I got was a Server not Found message, so here is more imgur XD
Fate Egg turning into Green Nymph + PU in hand and locket to feed their abilities was an insane amount of luck
I've been trying streaker with this deck

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and I managed 16 wins in a row (it is the most promissing one imo). The main problem is facing Wall, Horde and when Weaponsmith gets to the emerald shield too fast all of the others are wins with a regular draw.
How to make WDB beat a champion:
1 - make the required cards playable but only a situational support
2 - add an actually viable strategy that must work in spite of the wasted deck space
3 - ? ? ?
4 - PROFIT

05ksg034vc0550u03kvu03lin02ls103lv102m2g02m220274q01n4q01n470274b01n4b018ps
(http://i.imgur.com/1ubRDfO.jpg)
(http://i62.tinypic.com/10diezd.png)
We are also missing streaker. But this is THE luck based screenie, unles we can make something that beats all mages reliably (and semi-unupped)
Just rickrolled kirby:
(http://i.imgur.com/GxSMt3Y.jpg)
(http://i59.tinypic.com/2qum3wh.png)
Well, switching the chroma for the elemental weapons shouldn't ruin the deck... there will be several more weapons that you should hold onto until the end, though; Spite, Firebrand, and Epoch, to be specific. If Fluxor can't target Morning Star, then that just means adding in a Flying Weapon. Pulvy, Stormspike, and Scorpion Claws shouldn't cause any problems. The weapons do count as in-element, right?
Well, I managed a win with all 24 elemental weapons.
(http://i57.tinypic.com/64gt4m.png)

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I also swapped the diss shields for plain shields because I kept getting zerg rushed by cells; antimattering and using the diss shield were both hilariously ineffective. The flying weapon turned out to be ultimately unnecessary.
On a side note, that match took about 20 minutes.