| Skithiryx, the Blight Dragon | SOM-79 |
| Skitter Eel | RNA-53 |
| Skittering Crustacean | CN2-36 |
| Skittering Surveyor | DOM-230 |
| Skred | CSP-97 |
| Skulking Ghost | EMA-107 |
| Skull Raid | KHM-111 |
| Skullbriar, the Walking Grave | CMD-227 |
| Skullclamp | CMD-260 |
| Skullclamp | C20-251 |
| Skullclamp | C17-222 |
| Skullmulcher | 2XM-180 |
| Skullport Merchant | AFR-120 |
| Skullsnatcher | BOK-84 |
| Skullwinder | C20-189 |
| Sky Crier | SNC-31 |
| Sky Hussar | DIS-131 |
| Skybridge Towers | SNC-256 |
| Skyclave Shade | ZNR-298 |
| Skyhunter Skirmisher | MM2-32 |
| Skyhunter Strike Force | ONC-21 |
| Skyknight Vanguard | M20-218 |
| Skymarcher Aspirant | RIX-21 |
| Skyscanner | M19-245 |
| Skyshroud Behemoth | NEM-116 |
| Skyshroud Claim | NEM-117 |
| Skyshroud Elite | EXO-123 |
| Skysnare Spider | ORI-197 |
| Skyspear Cavalry | UMA-36 |
| Skyward Eye Prophets | CMA-193 |
| Skywatcher Adept | ROE-88 |
| Slag Fiend | NPH-95 |
| Slash of Talons | XLN-38 |
| Slaughter the Strong | CMR-48 |
| Slave of Bolas | E01-86 |
| Slavering Nulls | DDH-45 |
| Sleep | C15-106 |
| Sleep | M19-74 |
| Sleeper Agent | 10E-178 |
| Sleeping Potion | PLS-34 |
| Slimefoot, the Stowaway | DOM-205 |
| Sling-Gang Lieutenant | MH1-108 |
| Slip Through Space | OGW-47 |
| Slippery Bogle | EVE-160 |
| Slipstream Eel | CM2-49 |
| Slither Blade | AKH-71 |
| Sliver | TMOC-2 |
| Sliver Hivelord | M15-211 |
| Slobad, Goblin Tinkerer | C16-133 |
| Smash to Dust | DMU-144 |