Apologies to all for the delay in judging - It's been a week! (I mean that both in the literal and metaphorical ways!)
Anyway, I've added comments to the previous post for each card and here I will post some more general thoughts and the winners.
First, some statistics: all but one entry chose to use 2 mechanics (the exception being spineflu using 3). And the distribution was:
Conditions: 5
Trade: 5
Dawn: 4
Worshippers: 2
- Action / - Buy: 2
Freezing: 2
Aquatic: 2
Kin: 1
Wonders: 0
I did find this contest especially hard to judge (though eventually, it was fun). Mostly because for each card it requires you to try to understand 2 different untested mechanics. And then how they would interact. And then compare that to other cards that use two other (usually) different mechanics. So, please forgive me, if I got anything horribly wrong. I went my best guess on how things would work. Additionally, I tried to think about a mechanic was truly needed or there could be a way to do something similar using existing mechanics.
OK, after that:
Honorable Mention: spineflu's Mission (A Time to Preach / A Time to Build) for a 3 mechanic entry
Runners Up: Timinou's Ice Sculptor and Mahowrath's Fair Tide
and the Winner:
Aquila's Relief Aid (Disaster / Aftermath)