In the spirit of DanDan/Forgetful Fish, Triskaidekaphobia is all about lifeloss and lifegain.
I assume more copies of Triskaidekaphobia is the right answer, with the goal being to get multiple copies and force an opponent to be 13 or thirteen adjacent. Dusk Legion Zealots are mostly card draw and speed bumps for each other. Dash hopes and some life changing instants are intended to create some stack play despite the lack of blue counterspells.