Cheapest priced copy (Theros): $14.99 at Card Kingdom, near mint, their price list as of .
Medomai the Ageless 
Legendary Creature — Sphinx · 4/4 · Mythic · Theros · #196
Flying
Whenever Medomai deals combat damage to a player, take an extra turn after this one.
Medomai can't attack during extra turns.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
1 printing · $14.99 to $32.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Theros | 196 | Mythic | $14.99 | $32.99 |
2 rulings from Wizards of the Coast
- 15 September 2013An "extra turn" is any turn created by a spell or ability. Notably, it doesn't include additional turns taken in tournaments after time expires for a round.
- 15 September 2013It doesn't matter whose turn it is. In very rare cases, an opponent may be taking an extra turn and gain control of Medomai. Medomai can't attack during that turn.