First, you only have 4 creatures. That means, Emphatic Bond would heal you at max 4 HP per turn. Sanctuary is better in this case since it heals you 4 HP per turn no matter how many creatures you have on the field. Also, if you focus on Acceleration, you should heal your creature, not your own HP. That being said, Purify is better in this case. Of course, you should change the Emerald Pillars accordingly.