Cheapest priced copy (Commander 2020): $0.69 at Card Kingdom, near mint, their price list as of .
Sanctuary Blade 
Artifact — Equipment · Rare · Commander 2020 · #69
As this Equipment becomes attached to a creature, choose a color.
Equipped creature gets +2/+0 and has protection from the last chosen color.
Equip {3}
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
1 printing · $0.69 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Commander 2020 | 69 | Rare | $0.69 | — |
2 rulings from Wizards of the Coast
- 17 April 2020If Sanctuary Blade is somehow attached to a creature without a color having been chosen for it, it doesn't grant a protection ability to the creature. The creature doesn't gain protection from colorless.
- 17 April 2020Activating Sanctuary Blade's equip ability targeting the creature it's already attached to won't let you choose a new color.