FOILCheapest priced copy (Murders at Karlov Manor): $0.69 at Card Kingdom, near mint, their price list as of .
Barbed Servitor 

Artifact Creature — Construct · 1/1 · Rare · Murders at Karlov Manor Promos · #77s
Indestructible
When this creature enters, suspect it. (It has menace and can't block.)
Whenever this creature deals combat damage to a player, you draw a card and you lose 1 life.
Whenever this creature is dealt damage, target opponent loses that much life.
Legal inCommanderBrawlStandardPioneerModernLegacyVintage
Not legal inPauper
4 printings · $0.69 to $3.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Murders at Karlov Manor | 77 | Rare | $0.69 | $0.99 |
| Murders at Karlov Manor | 398 | Rare | $0.99 | $1.49 |
| Murders at Karlov Manor Promos | 77p | Rare | $3.49 | $1.99 |
| Murders at Karlov Manor Promos | 77s | Rare | — | $2.79 |
7 rulings from Wizards of the Coast
- 2 February 2024A creature can be dealt an amount of damage greater than its toughness. For example, if Barbed Servitor is dealt 3 damage, its last ability causes the target opponent to lose 3 life.
- 2 February 2024If a creature is already suspected, suspecting it again won't have any effect.
- 2 February 2024There's no limit to the number of creatures that can be suspected simultaneously. Suspecting a new creature doesn't cause other creatures to stop being suspected.
- 2 February 2024If a suspected creature loses all abilities, it will lose menace and "This creature can't block", but it won't stop being suspected.
- 2 February 2024If your life total is brought to 0 or less at the same time that Barbed Servitor is dealt damage, you lose the game before its last ability goes on the stack.
- 2 February 2024When an effect suspects a creature, it becomes suspected. It gains menace and "This creature can't block" for as long as it's suspected. It stays suspected until it leaves the battlefield or another effect causes it to no longer be suspected.
- 2 February 2024Being suspected isn't a copiable value. If a permanent becomes a copy of a suspected creature, it won't be suspected.