I was initially worried about this pillar idea (seeing that it can heal for a small amount each time per pillar, almost stacking up to a better effect than SoG), but then I realized it was a permanent pillar that stacked, rather than a set of pillars/towers that have no limit to their usage.
Do you think this should be a rare card though? The individual 'mark' component is nice, but would the healing push it to make it more uncommon between decks?