Cheapest priced copy (Rise of the Eldrazi): $0.35 at Card Kingdom, near mint, their price list as of .
Time of Heroes 
Enchantment · Uncommon · Rise of the Eldrazi · #49
Each creature you control with a level counter on it gets +2/+2.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Rise of the Eldrazi | 49 | Uncommon | $0.35 | $0.49 |
2 rulings from Wizards of the Coast
- 15 June 2010Time of Heroes affects any creature you control with a level counter on it, not just levelers. (Of course, it’s pretty hard to get level counters onto a creature that’s not a leveler, but it can be done with copy effects, Fate Transfer, or Quicksilver Elemental, among other possibilities.)
- 15 June 2010Each creature you control with a level counter on it gets just +2/+2, regardless of how many level counters it has. It doesn’t get the bonus for each counter.