Cheapest priced copy (Ikoria: Lair of Behemoths): $0.35 at Card Kingdom, near mint, their price list as of .
Solid Footing 
Enchantment — Aura · Common · Ikoria: Lair of Behemoths · #31
Flash
Enchant creature
Enchanted creature gets +1/+1.
As long as enchanted creature has vigilance, it assigns combat damage equal to its toughness rather than its power.
Legal inCommanderPioneerModernLegacyVintagePauper
Not legal inBrawlStandard
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Ikoria: Lair of Behemoths | 31 | Common | $0.35 | $0.49 |
One ruling from Wizards of the Coast
- 17 April 2020Solid Footing’s last ability doesn’t change the enchanted creature’s power; it changes only the amount of combat damage that creature assigns. All other rules and effects that check power or toughness use the actual values. For example, if a creature fights while enchanted by Solid Footing, that creature will deal damage equal to its power, not its toughness.