Cheapest priced copy (The List): $0.69 at Card Kingdom, near mint, their price list as of .
Martyr's Bond 
Enchantment · Rare · Commander 2011 · #19
Whenever this enchantment or another nonland permanent you control is put into a graveyard from the battlefield, each opponent sacrifices a permanent of their choice that shares a card type with it.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
3 printings · $0.69 to $1.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Commander 2011 | 19 | Rare | $1.49 | — |
| The List | CMD-19 | Rare | $0.69 | — |
| Signature Spellbook: Gideon | 2 | Rare | $0.69 | $0.99Out of stock |
2 rulings from Wizards of the Coast
- 22 September 2011If Martyr’s Bond and other nonland permanents are put into the graveyard from the battlefield at the same time, Martyr’s Bond will trigger for itself and each of those other nonland permanents.
- 22 September 2011Each opponent must sacrifice only one permanent for each trigger, even if the nonland permanent you controlled that went to the graveyard had multiple types. For example, if an artifact creature you control is put into a graveyard from the battlefield, each opponent sacrifices exactly one artifact or creature, and that permanent doesn’t need to be an artifact creature.