Cheapest priced copy (Bloomburrow Commander): $1.29 at Card Kingdom, near mint, out of stock, their price list as of .
Plumb the Forbidden 
Instant · Uncommon · Bloomburrow Commander · #188
As an additional cost to cast this spell, you may sacrifice one or more creatures. When you do, copy this spell for each creature sacrificed this way.
You draw a card and lose 1 life.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
4 printings · $1.29 to $5.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Bloomburrow Commander | 188 | Uncommon | $1.29Out of stock | — |
| Secret Lair Drop | 7114 | Rare | $4.49 | $5.99 |
| Secrets of Strixhaven Commander | 224 | Uncommon | $1.29 | — |
| Strixhaven: School of Mages | 81 | Uncommon | $1.29 | $1.49 |
2 rulings from Wizards of the Coast
- 16 April 2021If you copy Plumb the Forbidden multiple times, each magecraft ability of a creature you control will trigger that many times.
- 16 April 2021If you sacrifice a creature with a magecraft ability to cast Plumb the Forbidden, that creature's ability will not trigger.