Booster 4
Released August 26, 1999 — 40 cards
| Set code | Card | Rarity |
|---|---|---|
| — | The Wicked Worm Beast | Common |
| — | Big Insect | Common |
| — | Fiend Kraken | Common |
| — | Axe Raider | Common |
| — | Faith Bird | Common |
| — | Orion the Battle King | Common |
| — | Dark Titan of Terror | Common |
| — | Gorgon Egg | Common |
| — | La Jinn the Mystical Genie of the Lamp | Common |
| — | Zone Eater | Common |
| — | Swordsman from a Distant Land | Common |
| — | Emperor of the Land and Sea | Common |
| — | Karakuri Spider | Common |
| — | Mechanicalchaser | Common |
| — | Mech Bass | Common |
| — | Aqua Dragon | Common |
| — | Giant Red Seasnake | Common |
| — | Barrel Rock | Common |
| — | Sea Kamen | Common |
| — | Cockroach Knight | Common |
| — | Brave Scizzar | Common |
| — | Turtle Bird | Common |
| — | Spirit of the Mountain | Common |
| — | Gemini Elf | Common |
| — | Man-eating Black Shark | Common |
| — | Fairy Dragon | Common |
| — | Fairy of the Fountain | Common |
| — | Amazon of the Seas | Common |
| — | Maiden of the Moonlight | Common |
| — | Winged Egg of New Life | Common |
| — | Queen of Autumn Leaves | Common |
| — | Gruesome Goo | Common |
| — | Warrior Elimination | Rare |
| — | Acid Rain | Rare |
| — | Eradicating Aerosol | Rare |
| — | Breath of Light | Rare |
| — | Eternal Drought | Rare |
| — | Graceful Charity | Common |
| — | White Hole | Common |
| — | Call of the Grave | Common |