An annoying Tirion stands in your way? And he has company right beside him? Sweat no more! Target the minion next to him and it will devolve him again and again until he becomes a mighty Wisp (if both minions survive long enough that is). Also, it makes the opponent to really need to trade the targeted minion. So, if you target an important minion, he will make an unfavorable trade just to kill it himself!
"Damage it deals" means any damage coming from the minion whether it's attack damage, counter-attack damage or effect damage. You can cast this on an enemy Ragnaros the Firelord to make it heal your stuff for example, or cast it on a high-attack minion and then attack it with a weapon to heal you.
In mose cases, it will be a soft removal though.
This is Lady Liadrin on the picture. Liadrin once forsake the Light only to embrace it again after Kael'Thas' betrayal. Hence the name "Back to the Light".
Flavour text: "Useless card does nothing!"- Saya the Soulpriest
This card essentially disables a minion's attacks, but also turns it into a source of healing for your own minions, allowing you to heal them by attacking into it. The flavour text references how a player would need to be careful when combining this card with Auchenai Soulpriest or Embrace the Shadows- it counts as your healing, so those two would negate its effects.