The synergies are not maxed. Its already useless as it is in this build. Magefist would be far better...tho the cold resist on trangs is nice the psn damage will not make psn nova that much better
The only thing Magefist has that Trangs doesn't is mana regeneration and +1 to fire skills, which is essentially useless with this build. You don't need much mana and the Necro doesn't use fire skills. The poison skill damage and cold resist of Trangs are much more useful in my opinion.
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"There's no doughnuts in Diablo. Oohhhh, I just threw it down. BlizzCon exclusive: no doughnuts. -Jay Wilson
The only thing Magefist has that Trangs doesn't is mana regeneration and +1 to fire skills, which is essentially useless with this build. You don't need much mana and the Necro doesn't use fire skills. The poison skill damage and cold resist of Trangs are much more useful in my opinion.
Why?
Trangs adds 25% to poison damage. If you're using Poison Nova it's invaluable.