NECROMANCER - DARK KNIGHT - CULTIST
That combo is perfect for the player who want to kill his enemies slowly. The Dark Knight is an offensive piece that can still taunt to defend his allies, the necromancer can summon undead and put debuff against the opposing team, the Cultist can be use as a healer but can also use death and curse magic. She also have access to Trickster magic that will provide a shield to prevent the debuff to be cure. The weakness of this team would be a low speed team, but once your curse are in place, the enemy should melt on his own.
Dark Knight- The Dark Knight don't have access to a lot of protection skill. You could use a shield if you want, but a 2 handed axe with some offensive artefact might be the punch that you need. Probably a Piercing Amulet & a Power Ring.
Necromancer- The Necromancer have access to the spear, but in that combo it would be wise to give him a staff with a stone necklace. That would make the necromancer as tough as the Dark Knight versus physical damage.
Cultist- The Cultist can be use as a dps but it also an expert with life magic , so she should be your healer if needed. You could equip her like the necromancer if you wanted to make her tougher but she have access to a shield. Personally I would prefer to give her a Mace & a Shield in case she don t get any good card, and give her an evasion ring with a mind ring to make sure people have hard time to resist her spell.
2 Anticure: Only the Cultist can play that card but that will protect all the debuff you put on your enemy.
Agony: Strongest curse that remove 20 HP a turn.
Vulnerable: Increase Magical and Physical dmg dealt. That will also increase the damage receive each turn because of your curse.
Healmore: Strongest spell available for the Cultist, because that team is so slow, expect that you would have been under some pressure since the start.
Taunt: Same idea, your team is slow, you don't want to face a 2 vs 3 before you even had a chance to play.
As you see the Dark Knight don't really have any card to play in your starting hand, he have a 2 handed axe with some artefacts that make him stronger. He don't need card to kill.