Maybe Spectral Procession instead of Midnight Haunting.

I think that Wayfaring Temple is a good card to keep in this deck, and i would keep 3 Growing Ranks. Also, with such a low curve, i dont think Elvish Mystic is worth it in this deck, Parallel Lives could be good for extra tokens? Also, Secure the Wastes could be a nice addition to the deck. As for a replacement for Midnight Haunting, I can't think of anything that would be better, except maybe Spectral Procession, the problem with that is for it to be a 3 drop, you need triple which is not ideal in a dual colour deck. I would recommend Feed the Clan for your sideboard over Heroes' Reunion as you will most likely have ferocious active through most of the game. One last suggestion, Beastmaster Ascension works well in most token decks, have you considered it in here? (Sorry for such a long comment btw)

Thanks JonOd and K00lDudE1 for the suggestions!

I removed Elvish Mystic already for some cards. Secure the Wastes and Parallel Lives are currently outside my budget but I'll keep a lookout for both.

I also have a single Wilt-Leaf Liege which I have been thinking about as a sideboard.

You really need to focus on speeding this deck up. Mana dorks like Llanowar Elves are the reason I often had 6 Essence of the Wild / Increasing Devotion on the field by turn 5, occasionally turn 4. Doomed Traveler 1 drop, that's good post board wipe/kill spell. Creakwood Liege seems like a pretty good possibility. Geist-Honored Monk absolute powerhouse that drops little minions. Hero of Bladehold Thraben Doomsayer Twilight Drover