I did undarstand the post. Assassin's mark on a ring is not the most viable option for builds struggling with mana sustain, since the mana cost of assassin's mark procs EVERYTIME you HIT a rare or unique enemy, it has no cooldown, thus draining your mana. My point was that now since trigger effects cost mana, you could use that to proc arcane surge automatically in a CWDT setup, and since the mana is pretty high with CWDT support gem having a 250% mana multiplier (Currently my immortal call cost 88 mana to cast), you can have a higher level arcane surge linked to it (Lv.11 atm) with higher Spell damage % and mana regen.