This deck only got minor adjustments from set 3, but I think it currently fits into the metagame really well (which is still quite in flux).
Worldbearer Behemoth is such a powerhouse and it's really safe to craft him, since he will fit in many time based decks. I would say the Friendly Wisp and maybe 1-2 Talir's Favored could be seen as Flex Slots. If (Rakano) Gunsslingers are there to stay it might be good to replace Mercenary with 2 more Praxis Displacer.