Cheapest priced copy (Alara Reborn): $0.99 at Card Kingdom, near mint, their price list as of .
Mask of Riddles 
Artifact — Equipment · Uncommon · Alara Reborn · #25
Equipped creature has fear. (It can't be blocked except by artifact creatures and/or black creatures.)
Whenever equipped creature deals combat damage to a player, you may draw a card.
Equip {2}
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
2 printings · $0.99 to $6.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Alara Reborn | 25 | Uncommon | $0.99 | $6.99 |
| New Capenna Commander | 347 | Uncommon | $1.29 | — |
One ruling from Wizards of the Coast
- 1 May 2009If a Mask of Riddles you control somehow winds up equipping a creature you don't control, Mask of Riddles's triggered ability will still trigger whenever that creature deals combat damage to a player (even if that player is you). You will control that ability, so you may draw a card.