Since it's an instant, you simply pass your turn, wait until your opponent's upkeep, and then cast it, which is very close to getting an extra turn (the main difference is that your opponent will get to untap)
Unless your opponents can counter the 'hoof, or deploy a board wipe or fog effect at instant speed, they're toast
This usually clears your deck of your fatties and lets you recur the most suitable at your leisure from then on without having to hold discard outlets or risk getting bad draws
The 237, the 236.6, and the 236.5
While being in three colors and a total of seven mana can be a bit of a pain to work around, it still can be a neat bit of tech to deal with difficult opponents
Scion of Draco Despite costing 12 mana, Scion of Draco can be cast for effectively 2 mana, thanks to triomes and Leyline of the Guildpact