Cheapest priced copy (Theros): $1.29 at Card Kingdom, near mint, their price list as of .
Prophet of Kruphix 
Creature — Human Wizard · 2/3 · Rare · Theros · #199
Untap all creatures and lands you control during each other player's untap step.
You may cast creature spells as though they had flash.
Legal inPioneerModernLegacyVintage
Banned inCommander
Not legal inBrawlStandardPauper
2 printings · $1.29 to $7.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Magic 2015 Clash Pack | 5 | Rare | — | $5.49 |
| Theros | 199 | Rare | $1.29 | $7.99 |
5 rulings from Wizards of the Coast
- 15 September 2013Controlling more than one Prophet of Kruphix doesn't allow you to untap any creature or land more than once during a single untap step.
- 15 September 2013Creatures and lands you control untap at the same time as the active player's permanents. You can't choose to not untap them at that time.
- 15 September 2013The last ability applies to creature cards in any zone, provided something is allowing you to cast them. For example, if you control a Zombie, you could cast Gravecrawler (a creature with “You may cast Gravecrawler from your graveyard as long as you control a Zombie”) from your graveyard as though it had flash.
- 15 September 2013Effects that state a creature or land you control doesn't untap during your untap step won't apply during another player's untap step.
- 15 September 2013If you're casting a creature spell with bestow, whether or not it has flash will depend on if you're casting it as a creature or as an Aura. Prophet of Kruphix won't give flash to a spell with bestow you're casting as an Aura.