Cheapest priced copy (Secrets of Strixhaven Commander): $0.49 at Card Kingdom, near mint, their price list as of .
Keen Duelist 
Creature — Human Wizard · 2/2 · Rare · Secret Lair Drop · #828
At the beginning of your upkeep, you and target opponent each reveal the top card of your library. You each lose life equal to the mana value of the card revealed by the other player. You each put the card you revealed into your hand.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
4 printings · $0.49 to $5.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Commander 2021 | 42 | Rare | $0.79 | — |
| Commander 2021 | 369 | Rare | $2.49 | — |
| Secret Lair Drop | 828 | Rare | $5.49 | $2.79 |
| Secrets of Strixhaven Commander | 218 | Rare | $0.49 | — |