Cheapest priced copy (Ixalan): $0.35 at Card Kingdom, near mint, their price list as of .
Imperial Lancer 
Creature — Human Knight · 1/1 · Uncommon · Ixalan · #15
This creature has double strike as long as you control a Dinosaur.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Ixalan | 15 | Uncommon | $0.35 | $0.49 |
One ruling from Wizards of the Coast
- 29 September 2017If you no longer control a Dinosaur after the first-strike combat damage step, Imperial Lancer won’t have double strike, and so it won’t deal regular combat damage.