J Bame
Terrarian
Because OOA accessories are already good items, so an upgrade to an OOA accessory is a buff, and buffing good items makes them opI don't understand why we're talking about an OP item here
What i'll say here goes for your Sharp necklace idea too, Summoner already has good accessories at every stage. There is no harm in adding more, but you can be much more creative than "minion slot/damage increase"