Originally Posted by ROOOOOAST
Champ who buy this are : irelia, shen, cho, warwick.
Any champion against an AP bruiser should have some sort of MR. Fiora might have some other choices in mind. Udyr is a good choice. Someone mentioned Shyvana. I would build it on teemo vs singed. Volibear is another choice. Shaco or on Hit LB. Rammus as it seems to be the only decent damage / defensive item he can get. Granted Ionic spark is gone, but putting on hit on a twitch is always funny.
I would also build one if my team was so stupid as to go all AD. Pantheon mid, Riven top, Miss Fortune bot with nami support, and Lee Jungle. Seems dumb but I even have a rune page set up since s1 of all armor.