"Malygos" Hunter

These are obviously the bread and butter of the deck. They allow you to actually kill your opponent, which is always useful. You generally want to keep any of these cards in your mulligan.

Against aggro, you obviously want early-game tempo to help you survive to your combo. The secrets can help with this, though we are really hurting due to the lack of Wandering Monster. Some other cards which are okay to keep against aggro if the rest of your hand is decent would be Marked Shot and Shimmerfly. In this matchup, don't be afraid to use a few combo pieces to survive. You would obviously rather point them at your opponent's face, but you can't combo them on turn 8 if you die on turn 7.