Immortal Wind Ghost card is dream for every auto-caster. It's as rare as MVP card tho, as you have a chance to encounter only one in an instance. I don't think there are many weapon cards that useful for Hindsight, but I suggest you to go for magic damage % card or M.Def piercing combo card (Big Ben, Nightmare Mimic). If you insist on auto-cast weapon card I suggest Mutant Dragonoid for the cheapest to Immortal Wind Ghost/Immortal Bloody Knight for the most expensive.
For headgear, I can only think Red Lichtern, Blue Lichtern, and Tikbalang. I don't know if it good idea to put those cards in Zaha, as it will decrease it resell value. I use those cards for Magician Night Cap.
For armor, I still hesitating about my Flattery robe too. For no brainer card I can only think Agav, but I prefer use element card, especially Evil Druid or Bathory for various instances.
Another suggestion, I prefer use Elemental Robe for Hindsight mode, because it add 10% ASPD, +5 MATK per 2 refine, and the most important: auto-cast Thunderstorm lvl 5 or higher level learned (also auto-cast Fireball lvl 5 or higher lvl learned if you wear Elemental Origin+Cape). It proc a lot, and together with Evil Spirit Glove, Hindsight builds will have AoE disposal. 2 Hill Wind cards on Elemental Origin can boost Thunderstorm damage (and LoV if you use Owl Marquees+Viscount card combo)