With Borborygmos Enraged and Surly Badgersaur in play, and three lands in your graveyard or hand, cast Slogurk
When Slogurk comes into play, he returns three lands from your graveyard to your hand.
Discard three lands with Borborygms ability to deal damage to the opponent
Surly Badgesaur's ability will trigger, create three Treasure tokens
Slogurk's ability will trigger, put three +1/+1 counters on it.
Remove a +1/+1 counter from Slogurk to return it to your hand
Sacrifice the Treasures to cast Slogurk again
Repeat process for infinite damage