Cheapest priced copy (Foundations Jumpstart): $0.35 at Card Kingdom, near mint, their price list as of .
Ruthless Knave 
Creature — Orc Pirate · 3/2 · Uncommon · Ixalan · #119
{2}{B}, Sacrifice a creature: Create two Treasure tokens. (They're artifacts with "{T}, Sacrifice this token: Add one mana of any color.")
Sacrifice three Treasures: Draw a card.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
3 printings · $0.35 to $4.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Foundations Jumpstart | 483 | Uncommon | $0.35 | — |
| The List | XLN-119 | Uncommon | $0.35 | — |
| Ixalan | 119 | Uncommon | $0.35 | $4.99 |
2 rulings from Wizards of the Coast
- 29 September 2017You can sacrifice Ruthless Knave to pay the cost for its first ability.
- 29 September 2017The Treasures you sacrifice to activate Ruthless Knave's last ability can't also be sacrificed for mana.