The cube had anywhere from 3-5 Blood Artist effects depending on how you counted, and this swap is a way to lower that number. I will watch closely to see if the black decks don't do as well with this change.

Uncomfortable Chill is being removed as Silundi Vision Seemed to constantly underperform, failing to hit most of the time. Beyeen Veil is a decent replacement that might help the slower decks do better against aggro, but was too similar to Uncomfortable Chill, which is being changed into a straightforward card draw spell in Sift.