This vintage combo turns your graveyard into a high-speed engine by leveraging Fastbond, which lifts the restriction on how many lands you can play each turn so long as you can stomach the incremental damage. By invoking Perennial Behemoth, you gain the ability to continuously play those lands straight out of your graveyard rather than your hand. Sylvan Safekeeper acts as the essential outlet that quietly converts the lands you are playing into shroud for your creatures, allowing you to sacrifice the exact same land repeatedly to fuel the loop while generating endless landfall triggers and mana from any lands that enter the battlefield untapped.