Cheapest priced copy (Theros Beyond Death): $0.35 at Card Kingdom, near mint, their price list as of .
Lagonna-Band Storyteller 
Creature — Centaur Advisor · 3/4 · Uncommon · Theros Beyond Death · #27
When this creature enters, you may put target enchantment card from your graveyard on top of your library. If you do, you gain life equal to its mana value.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Theros Beyond Death | 27 | Uncommon | $0.35 | $0.49 |
One ruling from Wizards of the Coast
- 24 January 2020If a card in a player’s graveyard has {X} in its mana cost, X is considered to be 0.