Cheapest priced copy (Forgotten Realms Commander): $3.99 at Card Kingdom, near mint, their price list as of .
Belt of Giant Strength 
Artifact — Equipment · Rare · Forgotten Realms Commander · #38
Equipped creature has base power and toughness 10/10.
Equip {10}. This ability costs {X} less to activate, where X is the power of the creature it targets.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
2 printings · $3.99 to $4.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Forgotten Realms Commander | 38 | Rare | $3.99 | — |
| Forgotten Realms Commander | 307 | Rare | $4.99 | — |
One ruling from Wizards of the Coast
- 23 July 2021Belt of Giant Strength will overwrite any previous effects that set the creature's power and toughness to specific numbers. Effects that otherwise modify the equipped creature's power and toughness will still apply no matter when they took effect. The same is true for +1/+1 counters.