Cheapest priced copy (Foundations Commander): $0.79 at Card Kingdom, near mint, their price list as of .
Mutilate 
Sorcery · Rare · Magic 2013 · #102
All creatures get -1/-1 until end of turn for each Swamp you control.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
9 printings · $0.79 to $54.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Warhammer 40,000 Commander | 203 | Rare | $1.49 | — |
| Warhammer 40,000 Commander | 203★ | Rare | — | — |
| Commander 2014 | 150 | Rare | $1.99 | — |
| Duel Decks: Garruk vs. Liliana | 55 | Rare | $0.99 | — |
| Foundations Commander | 117 | Rare | $0.79 | — |
| Duel Decks Anthology: Garruk vs. Liliana | 55 | Rare | $2.49 | — |
| Magic 2013 | 102 | Rare | $1.99 | $3.99 |
| Mystery Booster 2 | 45 | Rare | $0.99 | — |
| Torment | 73 | Rare | $4.49 | $54.99 |
One ruling from Wizards of the Coast
- 1 July 2012The effect is based on the number of Swamps you control when Mutilate resolves. Only creatures on the battlefield at that time will be affected. The effect won't change later in the turn, even if the number of Swamps you control changes.