Cheapest priced copy (Modern Horizons): $0.35 at Card Kingdom, near mint, their price list as of .
Reprobation 
Enchantment — Aura · Common · Modern Horizons · #23
Enchant creature
Enchanted creature loses all abilities and is a Coward creature with base power and toughness 0/1. (It keeps all supertypes but loses all other types and creature types.)
Legal inCommanderModernLegacyVintagePauper
Not legal inBrawlStandardPioneer
2 printings · $0.35 to $3.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Modern Horizons | 23 | Common | $0.35 | $3.49 |
| The List | MH1-23 | Common | — | — |
5 rulings from Wizards of the Coast
- 14 June 2019If a noncreature permanent becomes a creature and is enchanted with Reprobation, it will remain a creature thanks to Reprobation’s effect, even when the original effect that made it a creature expires.
- 14 June 2019The enchanted creature retains any supertypes it had, such as legendary or snow.
- 14 June 2019If the enchanted creature gains an ability after Reprobation becomes attached to it, it will keep that ability.
- 14 June 2019Reprobation overwrites all previous effects that set the enchanted creature’s creature types, card types, power, and/or toughness to specific values. Other effects that set these characteristics to specific values that start to apply after Reprobation becomes attached will overwrite that portion of the effect.
- 14 June 2019Effects that modify the enchanted creature’s power or toughness (such as the effects of Force of Virtue or Giant Growth) will apply 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).