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Well, I'd say Midnight Haunting , Lingering Souls , Gather the Townsfolk , or any other token producing spell would work with creatures like Geist-Honored Monk or Crusader of Odric since you're not only putting more creatures on the field, but boosting your win-con. There are actually a lot of W/B decks that run token successfully, though that starts to take you away from the 'spirit' theme. I haven't looked enough into Soulbond yet to come up with anything at the moment.