i have done this build before several times. I don't really like to be tanky coz I feel the whole point of playing Sona is lost but I understand with recent heal/shield & moonstone nerfs u have to get creative. This build definitely works but I would take it with a pinch of salt. Just because heal/shield is nerfed doesn't mean we should not build any of the items-staff/ardent. They still give lot of good stats for your team. Also I dont understand how much tankier sona needs to get since this is a 'durability' patch aka we are in much better position than before to not get one shot so just stat checking enemy might be more efficient than getting tankier...(also I pray they buff her a little somewhere or reduce her mana costs a little bit coz right now it feels awful to play her)