Cheapest priced copy (Ikoria: Lair of Behemoths): $0.35 at Card Kingdom, near mint, their price list as of .
Sanctuary Lockdown 
Enchantment · Uncommon · Ikoria: Lair of Behemoths · #28
Humans you control get +1/+1.
{2}, Tap two untapped Humans you control: Tap target creature an opponent controls.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Ikoria: Lair of Behemoths | 28 | Uncommon | $0.35 | $0.49 |
2 rulings from Wizards of the Coast
- 17 April 2020Because damage remains marked on a creature until the damage is removed as the turn ends, nonlethal damage dealt to a Human you control may become lethal if Sanctuary Lockdown leaves the battlefield during that turn.
- 17 April 2020Since Sanctuary Lockdown’s activated ability doesn’t have a tap symbol in its cost, you can tap creatures that haven’t been under your control since your most recent turn began to pay the cost.