Cheapest priced copy (Magic 2015): $0.99 at Card Kingdom, near mint, their price list as of .
Soul of Theros 
Creature — Avatar · 6/6 · Mythic · Mystery Booster 2 · #19
Vigilance
{4}{W}{W}: Creatures you control get +2/+2 and gain first strike and lifelink until end of turn.
{4}{W}{W}, Exile this card from your graveyard: Creatures you control get +2/+2 and gain first strike and lifelink until end of turn.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
2 printings · $0.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Magic 2015 | 34 | Mythic | $0.99 | $0.99 |
| Mystery Booster 2 | 19 | Mythic | $0.99 | — |
2 rulings from Wizards of the Coast
- 18 July 2014Exiling the Soul from your graveyard is part of the last ability's activation cost. A player can't remove the Soul in response to prevent you from activating the ability.
- 18 July 2014You can activate the last ability only if the Soul is in your graveyard.