Take a look:
Boulderhead Mawtribe (+1 hp for mammoths, +1" bubble move for general...)
Frostlord on Stonehorn, general, brand of the sward artefact (+1 to hit for mount), mount trait: d6 mortals to an enemy with a 4 or better save
Huskard on Stonehorn, mount trait: +1 to hit rolls with horns
Butcher, additional spell: -1 to save or +1 attack
Stonehorn Beastriders
Mournfangs x4
Mournfangs x4
Gnoblars x20
Frost Sabres x2
2000pts
Eurlbad (6 to hit = 1 mortal wound)
119 wounds, most 4+ save, 5 drops
Ok so i'm not sure for the second artefact, +1 spell for butcher or auto dispell for huskard. 3 mammoths to maximise the charge capacity. If all the guys from the formation are in contact we have around 12 mortals per fight without charge or everwinter trait. Huskard can boost the mourfangs to deal 4 attacks 4+/3+/-1/dmg3 per mount in charge, stackable with butcher sorcery. Gnoblars and frost sabres help to control or deny teleportation. Great mobility and resilience, lots of mortal with eurlbad, charge, voltur, everwinter and sorcery, few drops, not so bad in counter magic in the firsts turns...