Cheapest priced copy (Murders at Karlov Manor Commander): $0.99 at Card Kingdom, near mint, their price list as of .
Esix, Fractal Bloom 
Legendary Creature — Fractal · 4/4 · Mythic · Murders at Karlov Manor Commander · #210
Flying
The first time you would create one or more tokens during each of your turns, you may instead choose a creature other than Esix and create that many tokens that are copies of that creature.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
3 printings · $0.99 to $2.79 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Commander 2021 | 10 | Mythic | — | $1.29 |
| Commander 2021 | 337 | Mythic | $2.79 | — |
| Murders at Karlov Manor Commander | 210 | Mythic | $0.99 | — |
5 rulings from Wizards of the Coast
- 16 April 2021This effect applies before anything that modifies how those tokens enter the battlefield.
- 16 April 2021If you choose not to apply the replacement effect, you will not get the choice to apply it again until your next turn.
- 16 April 2021If you choose a legendary creature, the copies will also be legendary. If this results in you controlling more than one legendary permanent with the same name, you'll put all but one of them into their owner's graveyard.
- 16 April 2021This effect can apply to any token, not just creature tokens. For example, you could replace creating a Treasure token with creating a copy of the chosen creature.
- 16 April 2021If you create one or more tokens during your turn, and then Esix comes under your control, the replacement effect won't apply to any tokens you create the rest of the turn. You'll have to wait until your next turn.