Doom blade not really, as most vampires, zombies (where you would swap out Victim of Night) are black. Walk the Plank could be used if I want to go outside of casual.

Dismember is nice vs indestructibles but Tragic Slip already accomplishes this.

Ultimate price is nice.

Which kill spells you run mostly come down to what your local meta is. Victim of Night is currently good enough for me.

Dash Hopes is nice as a way to have something against artifacts and enchantments, or just as 2 mana 5 damage. I'll see if that's worth it (now that I have a few cards with 3 devotion, it may be)

What about Blighted Fen as a way to deal with hex proof.

A bit too expensive and I don't use colorless mana a lot in a devotion deck. Already have Gatekeeper of Malakir and Desecration Demon that cause opponents to sacrifice :)

The biggest threats to this deck are removal, or wincons based on enchantments or artifacts. Ratchet bomb is included in the SB for that, but it's still a big weakness. I'm planning to change the sideboard so that there are more discard effects as a way to remove them before they're played!

Missed the gate keeper. And the demon doesn't force a sacrifice. Solid deck btw

It doesn't force it any more than that it's a 6/6 flyer that swings in your face if you don't :)

Thanks, appreciate the suggestions and thinking along! I've updated the sideboard with specters, which are a fine devotion-friendly way to get rid of those pesky artifacts/enchantments!