Cheapest priced copy (The Lost Caverns of Ixalan): $0.35 at Card Kingdom, near mint, their price list as of .
Ixalli's Lorekeeper 
Creature — Human Druid · 1/1 · Uncommon · The Lost Caverns of Ixalan · #194
{T}: Add one mana of any color. Spend this mana only to cast a Dinosaur spell or activate an ability of a Dinosaur source.
Legal inCommanderBrawlStandardPioneerModernLegacyVintage
Not legal inPauper
1 printing · $0.35 to $0.79 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| The Lost Caverns of Ixalan | 194 | Uncommon | $0.35 | $0.79 |
One ruling from Wizards of the Coast
- 10 November 2023A "Dinosaur source" is any object with the creature type Dinosaur. This means you could spend the mana to activate an ability of a Dinosaur you control or a Dinosaur card in your hand or graveyard, for example.