Cheapest priced copy (Journey into Nyx): $0.35 at Card Kingdom, near mint, their price list as of .
Disciple of Deceit 
Creature — Human Rogue · 1/3 · Uncommon · Journey into Nyx · #148
Inspired — Whenever this creature becomes untapped, you may discard a nonland card. If you do, search your library for a card with the same mana value as that card, reveal it, put it into your hand, then shuffle.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
1 printing · $0.35 to $1.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Journey into Nyx | 148 | Uncommon | $0.35 | $1.49 |
6 rulings from Wizards of the Coast
- 26 April 2014If an inspired ability triggers during your untap step, the ability will be put on the stack at the beginning of your upkeep. If the ability creates one or more token creatures, those creatures won't be able to attack that turn (unless they gain haste).
- 26 April 2014If there's an {X} in the mana cost of the card you discarded or the card you wish to search for, X is 0.
- 26 April 2014Inspired abilities don't trigger when the creature enters the battlefield.
- 26 April 2014Inspired abilities trigger no matter how the creature becomes untapped: by the turn-based action at the beginning of the untap step or by a spell or ability.
- 26 April 2014If the inspired ability includes an optional cost, you decide whether to pay that cost as the ability resolves. You can do this even if the creature leaves the battlefield in response to the ability.
- 18 April 2017The mana value of a split card is determined by the combined mana cost of its two halves.