There are really three ways to go with Scar-Vets. You can add a Cold One Mount to any of these if you want a higher armour save and more mobility (you can max out their armour with just generic upgrades and a mount)
Budget Hackface:
Scar-Vet w/halberd, light armour
(94 points)
Easily spammed, hits at S6, 4+ armour save.
Ninja Assassin:
Scar-Vet w/Sword of the Hornet, light armour, shield, Other Tricksters Shard
(133 points)
A tad more expensive, this guy specialises is going first with a lot of attacks to overwhelm his opponent. S5 is still pretty hard-hitting, and 3+ armour save is handy.
Tank:
Scar-Vet w/halberd, Talisman of Preservation, Potion of Speed
(139 points)
Hits as hard as budget Vet, but has a 4+ ward and 3+ armour. Potion is for helping him out versus faster opponents and insurance if your Slann doesn't hex the enemy/buff the Scar-Vet to go first.
The Ninja can be duplicated by using Sword of Swift Slaying (although 'Shard' is one per army, so maybe 'Dragonhelm' or something instead)
The Tank can be duplicated by dropping the Potion and taking Armour of Destiny instead.
Budget Hackface:
Scar-Vet w/halberd, light armour
(94 points)
Easily spammed, hits at S6, 4+ armour save.
Ninja Assassin:
Scar-Vet w/Sword of the Hornet, light armour, shield, Other Tricksters Shard
(133 points)
A tad more expensive, this guy specialises is going first with a lot of attacks to overwhelm his opponent. S5 is still pretty hard-hitting, and 3+ armour save is handy.
Tank:
Scar-Vet w/halberd, Talisman of Preservation, Potion of Speed
(139 points)
Hits as hard as budget Vet, but has a 4+ ward and 3+ armour. Potion is for helping him out versus faster opponents and insurance if your Slann doesn't hex the enemy/buff the Scar-Vet to go first.
The Ninja can be duplicated by using Sword of Swift Slaying (although 'Shard' is one per army, so maybe 'Dragonhelm' or something instead)
The Tank can be duplicated by dropping the Potion and taking Armour of Destiny instead.