Cheapest priced copy (Khans of Tarkir): $0.99 at Card Kingdom, near mint, their price list as of .
See the Unwritten 
Sorcery · Mythic · Khans of Tarkir · #149
Reveal the top eight cards of your library. You may put a creature card from among them onto the battlefield. Put the rest into your graveyard.
Ferocious — If you control a creature with power 4 or greater, you may put two creature cards onto the battlefield instead of one.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
1 printing · $0.99 to $2.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Khans of Tarkir | 149 | Mythic | $0.99 | $2.99 |
5 rulings from Wizards of the Coast
- 20 September 2014Because you’re not casting the creature cards, you can’t pay any additional or alternative costs. You can’t put the cards onto the battlefield face down.
- 20 September 2014You determine whether the ferocious ability applies before any creature cards are put onto the battlefield. If you put two creature cards onto the battlefield this way, those creatures enter the battlefield at the same time.
- 20 September 2014If a card you put onto the battlefield this way has {X} in its mana cost, X is considered to be 0.
- 20 September 2014Some ferocious abilities that appear on instants and sorceries use the word “instead.” These spells have an upgraded effect if you control a creature with power 4 or greater as they resolve. For these, you only get the upgraded effect, not both effects.
- 20 September 2014Ferocious abilities of instants and sorceries that don’t use the word “instead” will provide an additional effect if you control a creature with power 4 or greater as they resolve.