Cheapest priced copy (Weatherlight): $0.35 at Card Kingdom, near mint, their price list as of .
Revered Unicorn 
Creature — Unicorn · 2/3 · Uncommon · Weatherlight · #23
Cumulative upkeep {1} (At the beginning of your upkeep, put an age counter on this permanent, then sacrifice it unless you pay its upkeep cost for each age counter on it.)
When this creature leaves the battlefield, you gain life equal to the number of age counters on it.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
1 printing · $0.35 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Weatherlight | 23 | Uncommon | $0.35 | — |
2 rulings from Wizards of the Coast
- 1 April 2008If you choose not to pay Revered Unicorn’s cumulative upkeep, it will still get an age counter before being sacrificed, which impacts the amount of life you gain.
- 1 April 2008Revered Unicorn’s leaves-the-battlefield ability triggers no matter how it leaves the battlefield, not just when you don’t pay its cumulative upkeep.