As with Ruhan, we've a few power-doubling effects and stat boosts (Choose Your Weapon, Strength-Testing Hammer), Double Strike (Embercleave, Critical Hit), and other forms of combat-enhancement (Berserker's Frenzy, Kediss, Emberclaw Familiar)
But thats not all its good for
First Im going to tackle the politics that he pushes
Mari, the Killing Quill There are other assassins that add hit counters, but Mari, the Killing Quill can remove them to get you Treasure
The signpost uncommon in that set was Foggy Swamp Spirit Keeper, a typical draw-2 payoff that spits out 1/1 spirits which can only engage in combat with other spirits
Additionally, there will be a chance to obtain a non-foil 'A Whole New World' promo card during this time, but more details will be given in the future