I love playing Ziya. He can really give an advantage your team. Specially if you have a good jungler you can sanctify him and just like that you give him a buff in which increase his damage by +10 or +20 base on the increase of his overlimit like giving an ally a damage equipments.
Assassin emblem for penetration, blade of heptaseas, hunter strike and malefic roar as your core items, then you can juggle your last build between windtalker, berserker's fury or BOD
Genius wand, holy crystal, divine glaive, lightning truncheon, winter crown. -This build relies solely on damage, depending on your own gameplay you can adjust this build.
