Grunn, the Lonely King [Dominaria Prerelease Promos] Judge Gift Cards 2004 This explains why the goblins

This explains why the goblins remain unaffected

Set: Antiquities Type: Creature — Phyrexian Demon Rarity: Rare Cost: {4}{B}{B} Flying (This creature can't be blocked except by creatures with flying or reach

Sunastian has roots in both sorcery and swordplay

You and that opponent each gain control of all creatures the other controls until end of turn

If you search your library this way

Grunn, the Lonely King [Dominaria Prerelease Promos] Judge Gift Cards 2004 This explains why the goblinsSet: Dominaria Prerelease Promos Type: Legendary Creature Ape Warrior Rarity: Uncommon Cost: {4}{G}{G} Kicker {3} (You may pay an additional {3} as you cast this spell.) If Grunn, the Lonely King was kicked, it enters the battlefield with five +1 +1 counters on it. Whenever Grunn attacks alone, double its power and toughness until end of turn.