Cheapest priced copy (Ixalan): $0.35 at Card Kingdom, near mint, their price list as of .
Kinjalli's Caller 
Creature — Human Cleric · 0/3 · Common · Ixalan · #18
Dinosaur spells you cast cost {1} less to cast.
Legal inCommanderPioneerModernLegacyVintagePauper
Not legal inBrawlStandard
1 printing · $0.35 to $3.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Ixalan | 18 | Common | $0.35 | $3.49 |
2 rulings from Wizards of the Coast
- 29 September 2017To determine the total cost of a Dinosaur spell, start with the mana cost or alternative cost you're paying, add any cost increases, then apply any cost reductions. The mana value of the creature remains unchanged, no matter what the total cost to cast it was.
- 19 January 2018If an effect refers to a "[subtype] spell" or "[subtype] card," it refers only to a spell or card that has that subtype. For example, March of the Drowned is a card that benefits Pirates and features Pirates in its illustration, but it isn't a Pirate card.