Cheapest priced copy (Avatar: The Last Airbender Eternal): $9.99 at Card Kingdom, near mint, their price list as of .
Hei Bai, Forest Guardian 
Legendary Creature — Bear Spirit · 4/4 · Mythic · Avatar: The Last Airbender Eternal · #139
When Hei Bai enters, reveal cards from the top of your library until you reveal a Shrine card. You may put that card onto the battlefield. Then shuffle.
{W}{U}{B}{R}{G}, {T}: For each legendary enchantment you control, create a 1/1 colorless Spirit creature token with "This token can't block or be blocked by non-Spirit creatures."
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
2 printings · $9.99 to $17.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Avatar: The Last Airbender Eternal | 139 | Mythic | $9.99 | $10.99 |
| Avatar: The Last Airbender Eternal | 205 | Mythic | $15.99 | $17.99 |