Cheapest priced copy (Shards of Alara): $0.79 at Card Kingdom, near mint, their price list as of .
Blood Cultist 
Creature — Human Wizard · 1/1 · Uncommon · Shards of Alara · #157
{T}: This creature deals 1 damage to target creature.
Whenever a creature dealt damage by this creature this turn dies, put a +1/+1 counter on this creature.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
1 printing · $0.79 to $2.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Shards of Alara | 157 | Uncommon | $0.79 | $2.99 |
2 rulings from Wizards of the Coast
- 1 October 2008Each time a creature is put into a graveyard from the battlefield, check whether Blood Cultist had dealt any damage to it at any time during that turn. (This includes combat damage.) If so, Blood Cultist's second ability will trigger. It doesn't matter who controlled the creature or whose graveyard it was put into.
- 1 October 2008If Blood Cultist and a creature it dealt damage to are both put into a graveyard at the same time, Blood Cultist's ability will trigger, but it will do nothing when it resolves.