Cheapest priced copy (Portal Three Kingdoms): $799.99 at Card Kingdom, near mint, their price list as of .
Riding the Dilu Horse 
Sorcery · Rare · Portal Three Kingdoms · #144
Target creature gets +2/+2 and gains horsemanship. (It can't be blocked except by creatures with horsemanship. This effect lasts indefinitely.)
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
1 printing · $799.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Portal Three Kingdoms | 144 | Rare | $799.99 | — |
One ruling from Wizards of the Coast
- 1 October 2009The spell’s effect has no duration. The targeted creature gets +2/+2 until the game ends or it leaves the battlefield. It has horsemanship until the game ends, it leaves the battlefield, or some other effect causes it to lose horsemanship.