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The huge advantage of Healing of Naaman is that it can be played out of battle because it is a healing card.
(The easy way around this would be to discard Saul from your hand during the discard phase which would make him an eligible target for Healing of Naaman.)
Healing enhancementsA healing enhancement has the word “heal” in its special ability. “Heal” special abilities save a character from being discarded and/or remove the effect of all poisons and diseases on a character. You may play a healing enhancement at any time and its special ability activates even if played outside of battle.