Problem with abomasnow it can't counter scizor, it can't take a bullet punch.
Heatran gets wrecked by equake as well.
But appart from that don't just think move wise, jellicent is a great counter to scizor and gliscor.
Also the best counter to both is gliscor running 8 more speed evs than it usually would, ice dang would possibly Ohko gliscor but I doubt it, defiantly a 2hko