From a deckbuilding standpoint, Hammer of Purphoros is most intriguing as a tool for aggressive decks against control strategies
because everybody draws cards in your upkeep, you get the first chance to cast those cards, and your opponent cant draw cards then kill Winter before you draw
One of the more recent auctions of interest is for an extremely rare card called Snap Magikarp, which was thought to be long lost and impossible to find
Make sure to look up the rules so you know youre in compliance when going to a competition
As to how you get all these card types in your graveyard, there's the traditional route: have some creatures die in combat, cast a few spells, maybe a planeswalker will decide she's had enough of your shenanigans and sit in your graveyard for a while because her loyalty...look, not every metaphor works, okay