The List for this Challenge is:
­; ; ; ; ; ; ; ; ; .
For each card list which 2 you used to make it in the flavour text box.

I am totally up for this. But it is rather late at night, and I spent the day making 24(!) Mashup cards. Plus, I'm not sure what the best approach to this is. Would it be best to fill this editable 'set' with cards, then link to those cards in this thread? Perhaps it would be wisest if each challenge had only one rules card for the 'set', and the rest would be player submitted cards, again, all linked on the rule's cards thread?

Either way, I'm all over this.

That is pretty much the idea I had, make your cards and then submit a comment on the rules card linking your creations so there is a central repository to see all of them together.

I have entered! My cards are: Femeref Despoiler, Advanced-in-Years Scout, War Chewer, Pyrolexis, Delirious Daze. I tried to make the names obvious where the mashup came from rather than giving them names more customised for their individual existence.

I can't set a challenge without taking it myself so here are my entries:
(((Phyrexian Spoiler))), (((Delirium Chewer))), (((Pyrokinexis))), (((Undead Knight))) and (((Dazzling Scout))).
The first few were really easy but the last couple were a bit of a challenge to say the least.

Well, this was interesting. Some of my cards may have ended up a bit broken, though... ­Ingot Knight, Phyrexian Gladiator, Advance Pyrokineticist, Dazing Spoil, and Delirium Scalping. I had the opposite problem. The first few were hard, and then it got easier.

Well, there have been some very...interesting cards so far, which is great. There is also a lot of variety in which cards people have decided to mash together.

I looked at other people's cards and tried not to do the same mashup.

For example, I wanted to do a Dazing Scout with ", , Return an island you control to its owner's hand: Counter target spell unless its controller pays ."

OK I have completed my entries, they are (in order of creation):
(((Dazzleblade Scout))), (((Pyrokinetic War Beast))), (((Relicbane Centaur))), (((Delirious Gladiator))) & (((Spoilbeast))).
The last one is the only one that doesn't reference the names of both cards inits own name (I was originally calling it Spoilexis but it didn't sound that great).

Submitting Spell Spoiling and Scalping Beast

I decided to make a 2nd set of entries (had a brain exposion & thought I hadn't entered this one for some reason).
So here are my NEW entries: (((Phyrexian Scalper))), (((Pyrokinetic Daze))), (((Delirious Scout))), (((Spoiling Gladiator))) & Ingot Knight.

Pyro Chewer

Femeref Scout

Rolling Beast

Delirious Gladiator

Dazzlemind

­ Advance Knight, Dazed Scalpelexis, Gladiokinesis, Phyrexian Spoiler, Delirium Chewer.