man.. I had a completely different take on this set then almost everyone I guess. With all the people getting blinded by the 'zomg gold cards' I just threw every bear I possibly could together, and picked mardu for the midnight release for that reason. 2-0'd everyone within 20mins of each round. My bombs were Sarkhan and Butcher, but honestly they rarely even got played. Sarkhan won one game, butcher traded with another butcher in the one game I played him. It was all the war name aspirants, jeskai students, mardu skull hunters, valley dashers, etc.. that won all my games. Opponents were always too far behind by the time they got their game plan going.
I tried out Jeskai and Sultai, won both of those events as well but they were smaller fields and I tend to clean up at my shop in smaller events anyways. They were clearly weaker then Mardu, but I wanted to handicap myself a little. Sultai is the real 'ramp' deck in sealed, not Temur, imo. I was busting out Necropolis Fiend (my promo) on turn 4, or murderous cut + unmorph the 3/4 flyer on turn 6. I often won with like 3 cards left in my library, but I won damnit!
Jeskai is fun, but definitely fragile and the weakest clan. You need very specific cards for it to work, but I luckily got some of those in my pool. Jeskai Ascendancy and Dragon twins pull off some sick kills out of nowhere. Any prowess guys get crazy with ascendancy. Best play of the weekend was responding to opponents winter's flame that was tapping my dragon twins and shooting jeskai elder for 2, by using feat of resistance on elder, to then loot into icy blast that cast for 1 to tap down their remaining blocker and untap dragon twins so they could attack. Dealt 20 in a single turn there with those two creatures. 2 prowess and 2 ascendancy triggers, lulz.
Honorable mention goes to using my Clever impersonator on a Sorin.