Challenges: which allow 40 card decks?

[HornofAmmon]

I know the Shandalar 2.0 one does, I'm just wondering if any others do? Would save me time from trying a 40 deck version, before going to 60, for every other challenge like I'm doing. Thanks.

[aww1979]

The only one I've ever tried as a 40 card deck was shandalar 2.0, after cognis posted that you could in my challenge tutorial. (which I should maybe finish someday :p) I always assume you need a 60 card deck, unless otherwise specified.