Super High Risk Item Idea: Apocalypse Sword
Apocalypse Sword
+600 gold (4500 total)
+200 AD
UNIQUE Passive (The End is Near): When you die or become untargettable, this item is consumed.
Reasoning: a superweapon to end games, one way or the other. You can't Zhonya's, Guardian Angel or even be eaten by Tahm without this item being destroyed. It is essentially unusable on Master Yi or Fizz to prevent abuse cases like rushing it on super safe champs. If you buy this item, you are committing to winning the game before your next death or you will lose because you dumped 4500 gold into an item that's no longer there.
Of course, you can simply not buy it. No one forces you to buy it. But the option is there as a last ditch effort to come back, or to seal the deal.