In lower mana Haunted spirit is the best tank. Even in higher levels as a second tank it is good. I like Harklaw in high mana.

Oster Rotwell is a must in death in my opinion. He wipes out heavy magic decks. (A lot of back line healers tend to be magic). I tend to be picky when I play death but when I do I am usually successful.

Darkest mage is a good grab if you can afford one for lower mana matches.

I like the life leech as well but make sure they are protected or it is a waste. (Lich or bonesmith)

Other than that I try not to split my attack. I either choose to use no snipe and sneak or go all snipe and sneak.

Good luck!