Gruul Sligh is a fast aggro deck that aims to overwhelm you with efficient creatures like Jackal Pup, Mogg Fanatic, and Grim Lavamancer backed by burn spells. Your Pyroclasm effects are key — bring in the extra copy from the sideboard to have three total, as sweeping their small creatures buys the time needed for Terravore and Oath of Druids to take over. Zuran Orb is exceptional here, letting you sacrifice lands to gain life and offset their burn damage while also fueling Terravore's power. Winter's Grasp comes out because the matchup is typically decided before you need that kind of mana denial, and Naturalize has minimal targets game one since their threats are mostly creatures and spells. Keep your land destruction and Rishadan Port plan intact to deny Karplusan Forest and slow Grim Lavamancer activations.