This clever loop turns a simple one-mana creature into a self-sustaining engine by leveraging the passive command of the battlefield that Chulane, Teller of Tales provides. As you repeatedly cast Shrieking Drake, Chulane's triggered ability lets you drop Boros Garrison onto the board for free every single time. That bouncing land then feeds itself back to your hand via its own entry trigger while simultaneously activating Tireless Provisioner to mint the exact mana needed to keep casting the Drake.