Seeker's Armguard
Alright, let me preface this by saying I've only been playing since season five, so I don't know about anything that came before that. But I will say that Seeker's Armguard is a very strange item to me. It's just an item in the build path for Zhonya's, and it's stats are not great, but not bad. Its passive though has always struck me as a bit odd. It doesn't really fit with the item it's used to build into, which is usually bought for those few seconds of immunity to anything. Armguard, on the other hand, has a stacking mechanic where you gain bonus AP and Armor for killing creeps, champs, and anything else. Why doesn't this item build into something where this stacking mechanic gets used, or just scrubbed out altogether and replaced with something else? Or even just removed from the game and replaced entirely? It's just a very strange step on the ladder of items that lead you into Zhonya's.