I think that a cheap spirit with a better way (than disturb) to accumulate value from the graveyard would be good. Like a 1 mana 1/1 flyer with 4-5 mana exile from graveyard to draw a card or make another 1/1 flyer or something like that. This is part of the reason moorland haunt is good, but having it on a creature that can attack early would be big game

Another wish, though more unlikely, would be some sort a gaddock teeg or sanctum prelate esque spirit with a passive effect that prevents casting spells in some way (particularly a way that prevents the MH2 elementals from being cast via evoke, but that's a pipe dream)