Cheapest priced copy (Iconic Masters): $0.35 at Card Kingdom, near mint, their price list as of .
Diminish 
Instant · Common · Magic 2011 · #52
Target creature has base power and toughness 1/1 until end of turn.
Legal inCommanderModernLegacyVintagePauper
Not legal inBrawlStandardPioneer
3 printings · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Iconic Masters | 50 | Common | $0.35 | $0.49 |
| Magic 2011 | 52 | Common | $0.35 | $0.49 |
| The List | IMA-50 | Common | $0.35 | — |
2 rulings from Wizards of the Coast
- 17 November 2017Diminish overwrites all previous effects that set the target creature’s power and toughness to specific values. Other effects that set its power or toughness to specific values that start to apply after Diminish resolves will overwrite this effect.
- 17 November 2017Effects that modify the target creature’s power or toughness, such as the effects of Elesh Norn, Grand Cenobite or prowess, will apply to it no matter when they started to take effect. The same is true for counters that change the creature’s power or toughness (such as +1/+1 counters).