Need your Opinion - Hardest deck to pilot?

[PikWik]

In your opinion, what is the hardest deck to play well? of any format

From past experience (~2011), it has been gifts ungiven, combining eggs, to chain of vapor, but I haven't played that deck in years and I assume there is something else just as difficult by now?

Amulet maybe? or pod?

Please post your recommendations and link to a deck list, if possible.

Thanks yous!