Cheapest priced copy (Ikoria: Lair of Behemoths): $0.49 at Card Kingdom, near mint, their price list as of .
Lavabrink Venturer 
Creature — Human Soldier · 3/3 · Rare · Ikoria: Lair of Behemoths · #19
As this creature enters, choose odd or even. (Zero is even.)
This creature has protection from each mana value of the chosen quality.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
4 printings · $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Ikoria: Lair of Behemoths | 19 | Rare | $0.49 | $0.49 |
| Ikoria: Lair of Behemoths | 315 | Rare | $0.49 | $0.49 |
| Ikoria: Lair of Behemoths Promos | 19p | Rare | $0.49 | $0.49 |
| Ikoria: Lair of Behemoths Promos | 19s | Rare | — | $0.49 |
4 rulings from Wizards of the Coast
- 17 April 2020The mana value of a token that isn't a copy of another object is 0. A token that is a copy of another object has the same mana value as that object.
- 17 April 2020If Lavabrink Venturer somehow has no choice made for its ability, its last ability grants it no protection abilities.
- 17 April 2020You choose odd or even for Lavabrink Venturer before it enters the battlefield. There's no point at which players can target it before it has gained the appropriate protection abilities.
- 17 April 2020For spells with {X} in their mana costs, use the value chosen for X to determine the spell's mana value. If a permanent or card in any other zone has {X} in its mana cost, X is considered to be 0.