My next expansion idea is The Magnificent Masquerade! The thought is that Suramar is hosting a masquerade and all the Horde are invited!! Of course the Alliance would be sneaking in to the party as well.
From a keyword perspective, I thought of indulge. Since everyone at the masquerade would be drinking copious amounts of Arcwine, the idea seems like a good fit. It would grant a +1 mana at the start of your next turn.