this has been a great build for me so far in set 2 of TFT.
in the early game, I go for the crit item for kog'maw and maybe try to get gun blade on Volibare.
in the early game, I try my best to get a gold kog' maw and an Olaf. save the items for Olaf through the game until its a lost hope and you still don't have an Olaf.
If you have an Olaf by late mid-game your good if not just spend all your gold to try to get a 3-star Moudo or Volibare and maybe you will get an Olaf.
late game. In the late game your safe if you have a 1 star Olaf with full items or have a 2 star Olaf with bloodthirstier and an attack speed item. It's also good if you get
senged. try to get the glacial item for Moudo so you get the 4 glacial buff.