OK - It worked before in 3.1. Casting "slow fall" on you out of combat would buff you with your trinket buff... Then they changed the tool tip info for Illustration of the Dragon Soul to have it only effect "damaging" spells in 3.2. Supposedly nerfed?! Well, go ahead and cast 10x Slow Fall buff on you before your next boss fight and see what happens in 3.3 ... Here is my proof of me casting slow fall on me in a Pit of Saron run... (see my UI telling my buffs?)
[ame="http://www.youtube.com/watch?v=iqqMZFP9ZME"]YouTube- 3.3 Mage Exploit w/ Illustration of Dragonsoul[/ame]