Hearthpwn

I went for the Snobbish Noble, because the wordplay is so simple and elegant. It made me laugh - I can almost hear it said aloud in a blood elf voice - but it's also an interesting mechanic explained using clear and concise card text. Terrific economy of language.

And I also voted for Edwin, because it's a clever deck-building idea that's accessible to F2P players. As such, it's the exact opposite of Erin, although admittedly it would be fun watching wallet-heavy players flounder as they tried to make that card work with no real synergy among their 30 legendaries. Lapdogs, all of them...