Cheapest priced copy (Kaldheim): $0.49 at Card Kingdom, near mint, their price list as of .
Old-Growth Troll 
Creature — Troll Warrior · 4/4 · Rare · Kaldheim · #365
Trample
When Old-Growth Troll dies, if it was a creature, return it to the battlefield. It's an Aura enchantment with enchant Forest you control and "Enchanted Forest has '{T}: Add {G}{G}' and '{1}, {T}, Sacrifice this land: Create a tapped 4/4 green Troll Warrior creature token with trample.'"
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
4 printings · $0.49 to $2.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Kaldheim | 185 | Rare | $0.49 | $0.79 |
| Kaldheim | 365 | Rare | $0.69 | $0.79 |
| Kaldheim Promos | 185p | Rare | $0.69 | $2.99 |
| Kaldheim Promos | 185s | Rare | — | $0.69 |
4 rulings from Wizards of the Coast
- 5 February 2021If you control but don’t own Old-Growth Troll, you (not its owner) will return it to the battlefield when it dies. You’ll choose which Forest you control it will enchant as it returns to the battlefield.
- 5 February 2021If a token is a copy of Old-Growth Troll, it won’t return from its owner’s graveyard.
- 5 February 2021If there’s nothing for Old-Growth Troll to legally enchant, it remains in its owner’s graveyard.
- 5 February 2021If a nontoken permanent that's a copy of Old-Growth Troll dies while it is a creature, it will return to the battlefield as an Aura with both its own normal abilities and the two new abilities granted by old-Growth Troll. The resulting permanent will also retain its name, colors, and supertypes, but it will be an Aura enchantment with no other types or subtypes.