Cheapest priced copy (Fallout): $0.39 at Card Kingdom, near mint, their price list as of .
Corpsejack Menace 
Creature — Fungus · 4/4 · Uncommon · Iconic Masters · #197
If one or more +1/+1 counters would be put on a creature you control, twice that many +1/+1 counters are put on it instead.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
9 printings · $0.39 to $32.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Commander 2016 | 190 | Rare | $0.79 | — |
| Commander Anthology Volume II | 152 | Rare | $1.49 | — |
| Iconic Masters | 197 | Uncommon | $0.59 | $1.99 |
| Fallout | 214 | Uncommon | $0.39 | $3.99 |
| Fallout | 742 | Uncommon | — | $32.99 |
| The List | IMA-197 | Uncommon | $0.69 | — |
| Return to Ravnica Promos | 152★ | Rare | — | $2.49 |
| Return to Ravnica | 152 | Rare | $0.69 | $0.99 |
| Teenage Mutant Ninja Turtles Eternal (Humongous Fungus) | 56 | Rare | $0.49 | $6.99 |
2 rulings from Wizards of the Coast
- 17 November 2017If a creature you control would enter the battlefield with a number of +1/+1 counters on it, it enters with twice that many instead.
- 17 November 2017If you control two Corpsejack Menaces, the number of +1/+1 counters put on a creature is four times the original number. Three Corpsejack Menaces multiplies the original number by eight, and so on.