Cheapest priced copy (Amonkhet): $4.49 at Card Kingdom, near mint, their price list as of .
Oketra the True 
Legendary Creature — God · 3/6 · Mythic · Amonkhet · #21
Double strike, indestructible
Oketra can't attack or block unless you control at least three other creatures.
{3}{W}: Create a 1/1 white Warrior creature token with vigilance.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
3 printings · $4.49 to $57.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Amonkhet | 21 | Mythic | $4.49 | $8.99 |
| Amonkhet Invocations | 5 | Special | — | $57.99 |
| Amonkhet Promos | 21s | Mythic | — | $15.99 |
2 rulings from Wizards of the Coast
- 18 April 2017Once Oketra has attacked or blocked, it will remain in combat even if the number of other creatures you control becomes two or fewer.
- 18 April 2017You don't have to attack with three other creatures for Oketra to be able to attack. The same is true of blocking.