A Possible Series of Riddles #3

Rules
Please respect them:
1. One guess per person at a time, when I respond to you that is your cue to answer again or bask in your winning of the riddle.
2. Reading through the comments is cheating! Don't ruin it for yourself and others!
What Am I?
A tool of deception,
A tool of great beauty.
I can be quite reasonable,
Or even seem snooty.
I can make one thing another,
Transform through the skill of others.
Make a bird into a dragon,
Or a man into his brothers.
What was once hard to admire,
I turn to a masterpiece.
What once dulled your fire,
I now set passion ablaze.
Perhaps you need to fool the enemy,
Make like a tree and leaf.
I can do this for you too,
Even cover the grey tone of grief.
Beware your own vanity,
I may become your addiction.
Best of Luck!
Before you head into the comments, make sure you try to answer the riddle for yourself! Someone may have answered already and you wouldn't want to ruin the riddle for yourself!
When it comes to writing riddles, as I've written and lost hundreds, it is quite simple. Now, I don't often reveal the process to my writings lest others seek to steal and replace my ideas, but riddles are one thing I like to teach others how to build. The easy part is choosing what you want to write a riddle around, the hard part is seeing that object from the perspective of metaphor through the eyes of others.
After picking the answer, I try to think of the many uses I have for the object. What if that object were another human? How would this object function on another planet? How have I seen others using this object? What is an unconventional use for it? Can this object be included with other objects?
There are so many different facets of everything in life, and I think riddles have the potential to make the mundane seem complex and gorgeous.