Insidious Bookworms
Creature — Worm
When this creature dies, you may pay 
. If you do, target player discards a card at random.
- CMC
- 1
- Mana cost
- Color identity
- B
- Rarity
- common
- Set
- Coldsnap Theme Decks
- Price
- $0.15
- EDHREC rank
- #27953
Insidious Bookworms puts a repeatable discard trigger on the table for one black mana — every time it dies, each opponent discards a card, and you can recur it from the graveyard by discarding a card yourself. The cost is that it demands constant death-and-recursion loops to generate real value; as a static threat, it's a 1/1 that does nothing.
Format Analysis
Where it lives, where it can’t
| Format | Verdict |
|---|---|
| commander | legal |
| legacy | legal |
| modern | not legal |
| pioneer | not legal |
| standard | not legal |
| vintage | legal |
| pauper | legal |
| oathbreaker | legal |
In Commander, Insidious Bookworms slots into aristocrats and reanimator shells that already want creatures dying repeatedly — the group-slug discard effect compounds fast at a four-player table, and the self-recursion means it keeps coming back without needing dedicated graveyard support. Legacy and Vintage have faster, more deterministic discard engines, so Insidious Bookworms rarely makes the cut there outside of niche sacrifice synergy builds. Pauper is where it has the most competitive case: the common format lacks efficient repeatable discard at one mana, and sacrifice-based black decks can exploit the loop meaningfully.
Key Combos
Combo lines featuring this card
Price Context
Current price
$0.15 bulk tier
At $0.15, Insidious Bookworms is deep bulk — easy to pick up in any common bin or as a throw-in. Bulk commons with narrow applications tend to stay at this floor, so there's no meaningful price consideration here beyond just grabbing one if the synergy fits your deck.
Explore
Sources
Mentioned
Updated . Data from Scryfall, EDHREC, and Commander Spellbook.