Iroh, Dragon of the West

{x}{u}{r}, {t}: Prevent the next {x} damage dealt
to Iroh, Dragon of the West, Iroh deals
damage equal to that amount to target Creature an Opponent controls
"Did I ever tell you how I got the nickname "Dragon of the West?"
"I'm not interested in a lengthy anecdote, Uncle."
"It's more of a demonstration really."