Every Commander deck that cares about attacking or preserving its commander should be running a copy of Swiftfoot Boots if they dont have Lightning Greaves, and most decks can benefit from both
Valakut Exploration is probably the best, though
It featured in some of the earliest decks in the game, it was a pivotal piece of the Sligh deck which essentially acted as the foundation of the mono red aggro archetype, and its presence has been significant in Modern from the first day of the format as it has featured in many of the formats best decks from Zoo to Splinter Twin to Jund
Could maybe see some play in Dimir Tempo, though
Manga art cards like Vilis, Broker Of Blood and Evereth, Viceroy Of Plunder provide impressive gameplay mechanics
This article explores pregame actions, Leylines, Chancellors, companions, conspiracies, Serum Powder mulligans, Gemstone Cavern, Flash Hulk history, and other strange cards that affect the game before anyone plays a land