Cheapest priced copy (Planar Chaos): $0.69 at Card Kingdom, near mint, their price list as of .
Timbermare 
Creature — Elemental Horse · 5/5 · Rare · Planar Chaos · #140
Haste
Echo {5}{G} (At the beginning of your upkeep, if this came under your control since the beginning of your last upkeep, sacrifice it unless you pay its echo cost.)
When this creature enters, tap all other creatures.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
1 printing · $0.69 to $2.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Planar Chaos | 140 | Rare | $0.69 | $2.99 |