Cheapest priced copy (Prophecy): $0.69 at Card Kingdom, near mint, their price list as of .
Avatar of Might 
Creature — Avatar · 8/8 · Rare · Tenth Edition · #251
If an opponent controls at least four more creatures than you, this spell costs {6} less to cast.
Trample (This creature can deal excess combat damage to the player or planeswalker it's attacking.)
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
3 printings · $0.69 to $99.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Tenth Edition | 251 | Rare | $1.79 | — |
| Tenth Edition | 251★ | Rare | — | $4.49 |
| Prophecy | 109 | Rare | $0.69 | $99.99 |
One ruling from Wizards of the Coast
- 4 October 2004The mana value of this card is still 8, even if you only pay {G}{G} to cast it.