I started looking at Shadowmoor and Eventide to build two-color devotion decks way back when Devotion was first spoiled in Theros, but the cards were a lot of money, and I also moved on to other projects. I am back to this project, and, luckily, the prices of the cards have decreased a lot, with a few exceptions. I put $10 down, and I got pretty far.
Here is where I left off:
Shadowmoor Permanents for Devotion Part 1
Shadowmoor Permanents for Devotion Part 2
Eventide Permanents for Devotion Part 1
Eventide Permanents for Devotion Part 2
I also built many Devotion decks when Theros was in Standard
I have a lot of fun gathering up the cards from the bots.
I have already built the Blue/Black deck for this project back in June 2016.
Here is the status of these buys. White/Black, White/Red and Blue/Green are the ones I need to get the Lieges for.