Need to drop some card draw, probably because Etali does bring you (unpredictable) cards to your board (which sometimes cannot be used)
Eerie Interference: B It is three-mana, but it prevents all damage to both you and creatures, which I think lands it in low B, possibly high C
Standard has access to quite a few pieces for a Soul Sisters deck such as Lunarch Veteran, Cleric Class, Trelasarra, Moon Dancer and Cleric of Life's Bond
It is a powerful blend of tucking cards into libraries, but doesn't quite qualify
Whether my characters then challenge, quest or do nothing depends on the board state, but I always like to use all of my ink in the early turns on characters - they give you gameplay options and allow you to get ahead