OHKO clause should definitely be retested. For one, all the OHKO moves have an accuracy of 30%. THIRTY. PERCENT. Luck is definitely NOT on your side if you use these without a Wide/Zoom Lens. So, considering that, let's see what Pokemon in Ubers can use this:
-Dugtrio, which doesn't have the bulk to try twice
-Gastrodon, but Toxic is more effective, if slower.
-Groudon, definitely has the physical bulk, but Special bulk is iffy. Besides, attacking is more efficient.
-Hippowdon, much like Groudon in this regard.
-Landorus, but his bulk is iffy.
-Mamoswine, but bulk is sub-par, so it shouldn't take the gamble
-...no one in Ubers.
-Bisharp, but defenses are iffy.
-Gliscor, which COULD abuse this with Poison Heal, but Toxic or Earthquake is better.
-Abomasnow, but... it's Abomasnow.
-Kyogre, but it's better off just Water Spout-ing everything to death.
So as you can see, OHKO moves are actually either outclassed or put on Pokemon that won't have the defenses to try multiple times. Factor in the low PP, and you can see that OHKO moves are actually not so great.
As for the other clauses:
-Evasion Clause could be easily abused with Baton Pass. So no.
-As much as I want Glaile or Octillery to see some use, sadly, I'll have to say no to Moody Clause for one reason: Smeargle. It can just wait to get a ton of stat boosts, pass it on to something far more powerful ,then sit back and relax while their now-untouchable teammate KO's the entire opposing team.
-Sleep Clause I'll also have to say no to. Maybe in Gen 4 it could be lifted, but with Gen 5's new Sleep mechanics, Darkrai or Smeargle could make an entire team completely helpless.
-Species Clause is also a no. I don't want to face 6 Specs Kyogres. DX