Cheapest priced copy (Commander 2020): $10.99 at Card Kingdom, near mint, their price list as of .
Molten Echoes 
Enchantment · Rare · Commander 2020 · #54
As this enchantment enters, choose a creature type.
Whenever a nontoken creature you control of the chosen type enters, create a token that's a copy of that creature. That token gains haste. Exile it at the beginning of the next end step.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
2 printings · $10.99 to $12.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Commander 2020 | 54 | Rare | $10.99 | — |
| Crimson Vow Commander | 148 | Rare | $12.99 | — |
6 rulings from Wizards of the Coast
- 17 April 2020You must choose an existing creature type, such as Human or Warrior. Card types such as artifact and supertypes such as legendary can't be chosen.
- 17 April 2020If the copied creature has {X} in its mana cost, X is 0.
- 17 April 2020If the nontoken creature leaves the battlefield before Molten Echoes's triggered ability resolves, the token that's created uses the creature's last known information from before it left.
- 17 April 2020The token copies exactly what is printed on the creature and nothing else (unless that creature is copying something else; see below). It doesn't copy whether that creature is tapped or untapped, whether it has any counters on it or Auras and/or Equipment attached to it, or any non-copy effects that changed its power, toughness, types, color, and so on.
- 17 April 2020Any enters-the-battlefield abilities of the copied creature will trigger when the token enters the battlefield. Any “As [this creature] enters the battlefield” or “[This creature] enters the battlefield with” abilities of the copied creature will also work.
- 17 April 2020If the copied creature is copying something else, the token enters the battlefield as whatever that creature is copying.