| Set | Date | Rarity | Treatment |
|---|---|---|---|
| PLST #P02-89 | 2022-04-29 | Common | Standard |
| PHUK #27 | 2006-01-01 | Uncommon | Standard |
| PHUK #14 | 2006-01-01 | Uncommon | Standard |
| PHUK #2 | 2006-01-01 | Uncommon | Standard |
| 9ED #166★ | 2005-07-29 | Uncommon | Standard |
| 9ED #166 | 2005-07-29 | Uncommon | Standard |
| 8ED #167 | 2003-07-28 | Uncommon | Standard |
| 8ED #167★ | 2003-07-28 | Uncommon | Standard |
| P02 #89 | 1998-06-24 | Common | Standard |
Swarm of Rats's power is equal to the number of Rats you control.