Cheapest priced copy (Duel Decks: Heroes vs. Monsters): $0.35 at Card Kingdom, near mint, their price list as of .
Daily Regimen 
Enchantment — Aura · Uncommon · Morningtide · #8
Enchant creature
{1}{W}: Put a +1/+1 counter on enchanted creature.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
2 printings · $0.35 to $0.79 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Duel Decks: Heroes vs. Monsters | 18 | Uncommon | $0.35 | — |
| Morningtide | 8 | Uncommon | $0.39 | $0.79 |
One ruling from Wizards of the Coast
- 1 April 2008The +1/+1 counters that are put on the enchanted creature are independent of Daily Regimen. If Daily Regimen leaves the battlefield or is moved to another creature, the counters will stay put.