Wayyyyyy too situational. Most attacks will either fail to do anything, barely 2HKO, or OHKO. If you get REALLY LUCKY with this I suppose. Maybe 1 in 500 battles.
To give you an idea of how lucky you'd have to be:
252+ Atk (custom) (Move 1) vs. 252 HP / 252+ Def (custom): 338-398 (85.78 - 101.01%) -- 6.25% chance to OHKO
This is a random custom SE attack. Let's look at the possible damages:
338, 342, 344, 350, 354, 356, 362, 366, 368, 374, 378, 380, 386, 390, 392, 398
The bold ones are the ones that do not OHKO, but leave you in KO range for Sandstorm after being hit with them. That's a 6/16 (37.5%) chance, even with such a specific moves. Most moves will either OHKO or not do nearly that much damage.