Killing Wave+
Grave Pact+
Blood Artist+Token Generator+
Parallel LivesI have thought of an interesting combo. It will require some time and work to get out. First you will need a token generator like bitter blossom on the board with preferably
parallel lives to double the tokens produced. Then after a few turns bring out
grave pact and
blood artist. When both those cards are in play, play
killing wave with only one mana with the X=0. Keep
blood artist alive but kill all of your tokens. With
Grave pact, this will force your opponent to sacrifice creatures since your tokens have been destroyed. By the end
blood artist should gain you a lot of life while draining your opponent.