That Just Happened is a simple bu very useful WoW addon that allows you report when certain events happen, like Guardian Spirit on someone, or when a Polymorph breaks.
Below are the rules I currently use:
event;source;target;spellname;affiliation;channel;spam
SPELL_AURA_APPLIED;;;Hand of Salvation;;RAID;Hand of Salvation on *target (*source)
SPELL_AURA_APPLIED;;;Hand of Sacrifice;;RW;Hand of Sacrifice on *target (*source)
SPELL_AURA_APPLIED;;;Guardian Spirit;;RW;Guardian Spirit on *target (*source)
SPELL_AURA_APPLIED;;;Shield Wall;;RW;Shield [...]