Cheapest priced copy (Jumpstart 2022): $0.49 at Card Kingdom, near mint, their price list as of .
Dread Slaver 
Creature — Zombie Horror · 3/5 · Rare · Jumpstart 2022 · #405
Whenever a creature dealt damage by this creature this turn dies, return it to the battlefield under your control. That creature is a black Zombie in addition to its other colors and types.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
2 printings · $0.49 to $0.79 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Avacyn Restored | 98 | Rare | $0.59 | $0.79 |
| Jumpstart 2022 | 405 | Rare | $0.49 | — |
4 rulings from Wizards of the Coast
- 1 May 2012The card will return to the battlefield under your control only if it's still in the graveyard when the ability resolves. If it's not (perhaps because an ability like undying has already returned it to the battlefield), nothing happens.
- 1 May 2012If Dread Slaver and a creature it was blocking or blocked by both die in combat, Dread Slaver's ability will trigger.
- 1 May 2012Dread Slaver will return if it somehow dealt damage to itself and then dies.
- 1 May 2012Each time a creature dies, check whether Dread Slaver had dealt any damage to it at any time during that turn. If so, Dread Slaver's ability will trigger. It doesn't matter who controlled the creature or whose graveyard it was put into.