Cheapest priced copy (Fourth Edition): $0.35 at Card Kingdom, near mint, their price list as of .
Murk Dwellers 
Creature — Zombie · 2/2 · Common · Fifth Edition · #180
Whenever this creature attacks and isn't blocked, it gets +2/+0 until end of combat.
Legal inCommanderLegacyVintagePauper
Not legal inBrawlStandardPioneerModern
7 printings · $0.35 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Fourth Edition Foreign Black Border | 148 | Common | — | — |
| Fourth Edition | 148 | Common | $0.35 | — |
| Fifth Edition | 180 | Common | $0.35 | — |
| The Dark | 49 | Common | $0.35 | — |
| Introductory Two-Player Set | 21 | Common | — | — |
| Renaissance | 62 | Common | — | — |
| Rivals Quick Start Set | 20 | Common | — | — |
One ruling from Wizards of the Coast
- 15 April 2013An ability that triggers when something “attacks and isn’t blocked” triggers in the declare blockers step after blockers are declared if (1) that creature is attacking and (2) no creatures are declared to block it. It will trigger even if that creature was put onto the battlefield attacking rather than having been declared as an attacker in the declare attackers step.