Cheapest priced copy (Adventures in the Forgotten Realms): $0.35 at Card Kingdom, near mint, their price list as of .
Ray of Frost 
Enchantment — Aura · Uncommon · Adventures in the Forgotten Realms · #68
Flash
Enchant creature
When this Aura enters, if enchanted creature is red, tap it.
As long as enchanted creature is red, it loses all abilities.
Enchanted creature doesn't untap during its controller's untap step.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Adventures in the Forgotten Realms | 68 | Uncommon | $0.35 | $0.49 |
4 rulings from Wizards of the Coast
- 23 July 2021If the enchanted creature is red (or if it becomes red), it loses all abilities that it had prior to the time Ray of Frost became attached to it. It will keep any abilities that were granted to it after Ray of Frost became attached to it.
- 23 July 2021If the enchanted creature is red and has a characteristic-defining ability that specifies its power and/or toughness, that ability will not have its effect. In that case, its power and/or toughness (as appropriate) become 0.
- 23 July 2021Some noncreature permanents, such as Grand Master of Flowers, become creatures because of a static ability they have. If Ray of Frost becomes attached to such a creature and that creature is red or becomes red, that permanent will remain a creature even though it loses the ability that is making it a creature after that ability applies.
- 23 July 2021If the enchanted creature is red and has a characteristic-defining ability that specifies its types or colors, that ability will still have its effect because it's applied before the creature loses the ability.