Cheapest priced copy (Wilds of Eldraine): $0.35 at Card Kingdom, near mint, their price list as of .
Slumbering Keepguard 
Creature — Human Knight · 1/1 · Common · Wilds of Eldraine · #29
Whenever an enchantment you control enters, scry 1.
{2}{W}: This creature gets +1/+1 until end of turn for each enchantment you control.
Legal inCommanderBrawlStandardPioneerModernLegacyVintagePauper
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Wilds of Eldraine | 29 | Common | $0.35 | $0.49 |