Not Updated For Current Season
The masteries shown here are not yet updated for the current season, the guide author needs to set up the new masteries. As such, they will be different than the masteries you see in-game.
I have to create a Poppy build here since I have not seen any build with her with Frozen Mallet yet! Frozen Mallet is made for this Champion. Mercury Threads or Ninja Tabi depending on enemy team. If majority are magic users, you can swap 1 Phantom Dancer with Wit's End. Sheen is skipped for Zeal/Phantom Dancer. Philosopher's Stone for your early HP and MP regen. This will help you lessen your TP back to base. The extra gold is not bad too. If the game reaches its peak, buy Trinity Force or Infinity Edge in exchange with the Philosopher's Stone.