Slogurk and Surly Badgersaur trigger, putting a +1/+1 counter on Slogurk and creating a Treasure token.
Resolve the Borborygmos ability, dealing 3 damage to any target.
Repeat from step 1 two additional times.
Activate three Treasures by tapping and sacrificing them, adding 1.
Activate Slogurk by removing three +1/+1 counters from it, returning it from the battlefield to your hand.
When Slogurk leaves the battlefield, it triggers, returning three land cards from your graveyard to your hand.
Cast Slogurk by paying 1.
Repeat.
This clever loop turns the lands you discard into a relentless artillery strike, fueled by the terrifying wrath of Borborygmos Enraged. Every time you pitch a land to fuel that 3-damage ability, Surly Badgersaur kicks in to reward your discard with a precious Treasure token. Meanwhile, Slogurk, the Overslime happily grows a +1/+1 counter from that discarded land hitting your graveyard, eventually allowing you to bounce Slogurk back to your hand and trigger its leaves-the-battlefield ability to reclaim all three lands. By recasting Slogurk and feeding the generated Treasures back into your mana pool, you can loop this sequence indefinitely to obliterate any target.