Cheapest priced copy (Secrets of Strixhaven Commander): $0.49 at Card Kingdom, near mint, their price list as of .
Merchant of Venom 
Creature — Cat Warlock · 1/1 · Rare · Secrets of Strixhaven Commander · #76
Menace
When this creature enters, each player sacrifices a creature of their choice.
Whenever a player sacrifices a permanent, put a +1/+1 counter on this creature.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
2 printings · $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Secrets of Strixhaven Commander | 27 | Rare | $0.49 | — |
| Secrets of Strixhaven Commander | 76 | Rare | $0.49 | — |
One ruling from Wizards of the Coast
- 20 March 2026When Merchant of Venom's second ability resolves, first the player whose turn it is chooses which creature they're going to sacrifice, then each other player in turn order does the same. Players will know the choices of previous players when making their choices. Then all chosen creatures are sacrificed by their controllers simultaneously.