hard to get trinkets and all the casters who have begged, cajoled, even threatened me to try and get me to tank Heroic PoS this week (look, I can only tank it twice or more in a day if I get it randomly. No, I'm not going to run randoms for six hours on the off chance we'll be queued for H PoS.) here's some caster loot. It's a trinket, so you don't get much of a screenshot I'm afraid, so you get the Wowhead page.
Name: Nevermelting Ice Crystal
Type: Epic Trinket
Attributes: Increases spell power by 111 on equip, on use increases your critical strike rating by [184 * 71564u] for 20 sec. Every time one of your non-periodic spells deals a critical strike, the bonus is reduced by 184 critical strike rating. (3 Min Cooldown)