Darkmoon Card Lunacy, is it worth having Both?

Lunacy is not worthwile in my opinion -- how much gold you could make from selling it (or save form not buying it) vs. the benefit you'd get from the <10 stam it has over other fairly easily available trinkets.

In Kara you're not going to face a boss that will lolsmashurface. You could make an argument for Prince -- and it is nice to have a nice big HP buffer on that fight -- but <10 stam isn't going to make a difference if he catches you with HS down.

Good luck.
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Thanks guys for all your replies.

Fuzzy, Prince was definitely the foremost on my mind when considering stamina for tanking him. I'm currently at 12k unbuffed, uncrushable right now, hopefully i could hit 13k HP unbuffed before we get to him, although a stam trinket would go a long way into helping that. Will check the strats section for Prince info...

Some more thoughts: I did a look on wowhead for other comparative stamina trinkets that could (eventually) be available to me, some options are:

Timelapse Shard - I can get this now, not sure how good this one is, over any other real tanking trinket.

Violet Badge - Only at Aran in Kara atm, and if i need the extra stam to kill prince, then this kind of defeats the purpose as it requires you to kill him.

Argussian Compass - Looks good but I've never seen it drop!

Commander's Badge - Lol well this requires an Epic Mount purchase, which I'm quite far from
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Samildanach lvl 70 prot 0/49/12
Danathiel lvl 70 ret/holy 20/0/41
Ballin lvl 50 Holy

In the kingdom of the blind, the one-eyed man is king.

http://armory.wow-europe.com/character-sheet.xml?r=Kul+Tiras&n=Samildanach

Don't forget the two engineering trinkets (Gnomish Poultrylizer and Goblin Rocket Launcher). That's 45 stam each!
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To be honest, if Prince is your concern for stamina from trinks, you may be better off sticking with one Darkmoon card (vengeance) and using an avoidance trink for the other slot (Moroes pocket watch is nice for this). The extra dodge on-use is far more valuable to me during phase 2 than an extra 450-510 health (or whatever it is with Kings) which he'll eat through in no time flat.
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Dunno, DMC: Lunacy and Vengeance is crucial for my gearing, you can never have too much health. If you don't MT alot, you don't need it. If you do, you will need every little piece that helps.
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I've tanked Prince with less than 12k unbuffed HP with 3 healers, so I wouldn't sweat getting to 13k unbuffed super much.
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Menoch