Cheapest priced copy (Archenemy: Nicol Bolas): $0.35 at Card Kingdom, near mint, their price list as of .
Soul Ransom 
Enchantment — Aura · Rare · Gatecrash · #198
Enchant creature
You control enchanted creature.
Discard two cards: This Aura's controller sacrifices it, then draws two cards. Only your opponents may activate this ability.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
3 printings · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Archenemy: Nicol Bolas | 87 | Uncommon | $0.35 | — |
| Gatecrash | 198 | Rare | $0.49 | $0.49 |
| Modern Masters 2017 | 186 | Uncommon | $0.35 | $0.49 |
2 rulings from Wizards of the Coast
- 14 March 2017You'll draw two cards even if you can't sacrifice Soul Ransom, perhaps because it left the battlefield in response to Soul Ransom's ability.
- 14 March 2017In most cases, you'll enchant a creature controlled by an opponent, which will cause you to gain control of that creature. Any of your opponents can activate the last ability of Soul Ransom by discarding two cards. When that ability resolves, you'll sacrifice Soul Ransom and draw two cards.