Executioner's Calling is NOT the most rarely built item in the game.
Sites like Elophant and LoLKing show only in how many games was the item present in the endgame build. Obviously it's rare to end the game with Executioner's Calling in the inventory. When you check for Mortal Reminder, however, you can see it's being built in 2.5% games. It's still a rarely purchased item, but not even in the top 10 of least popular ones.
Ohmwrecker remains the least popular item, purchased in about 0.10% of games. The preseason changes (or: lack thereof to the item itself) solidified its state as a perfect example of what an item without a purpose is. 3 years and still no idea what to do with that one.
[zombie-brand-mindblown]
~Pyro out

and
. I don't them everygame, simply because there is no need for them in everygame. I used to love having a support build Ohmwrecker in a heavy dive comp to deactivate nexus turrets or inhib turrets.
never forget the Lizard Wizard