Cheapest priced copy (March of the Machine: The Aftermath): $16.99 at Card Kingdom, near mint, their price list as of .
Calix, Guided by Fate 
Legendary Enchantment Creature — Human Druid · 2/2 · Mythic · March of the Machine: The Aftermath · #76
Constellation — Whenever Calix or another enchantment you control enters, put a +1/+1 counter on target creature.
Whenever Calix or an enchanted creature you control deals combat damage to a player, you may create a token that's a copy of a nonlegendary enchantment you control. Do this only once each turn.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
6 printings · $16.99 to $64.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| March of the Machine: The Aftermath | 26 | Mythic | $16.99 | $17.99 |
| March of the Machine: The Aftermath | 76 | Mythic | $19.99 | $22.99 |
| March of the Machine: The Aftermath | 126 | Mythic | — | — |
| March of the Machine: The Aftermath | 165 | Mythic | $18.99 | $24.99Out of stock |
| March of the Machine: The Aftermath | 206 | Mythic | — | $64.99 |
| Secret Lair Drop | 7151 | Mythic | — | — |
8 rulings from Wizards of the Coast
- 12 May 2023Calix may be the target of its own constellation ability. This includes when Calix itself enters the battlefield.
- 12 May 2023If the copied permanent is a token, the token that's created copies the original characteristics of that token as stated by the effect that created that token.
- 12 May 2023If the copied permanent is copying something else, then the token enters the battlefield as whatever that permanent copied.
- 12 May 2023Any enters-the-battlefield abilities of the copied permanent will trigger when the token enters the battlefield. Any "as [this permanent] enters the battlefield" or "[this permanent] enters the battlefield with" abilities of the copied permanent will also work.
- 12 May 2023If the copied permanent has {X} in its mana cost, X is 0.
- 12 May 2023Calix's last ability doesn't target any permanent. You choose which nonlegendary enchantment you control you're creating a token copy of, if any, as the ability resolves. No player may take any actions between your choice and the creation of the token.
- 12 May 2023The token copies exactly what was printed on the original permanent and nothing else (unless that permanent is copying something else or is a token; see below). It doesn't copy whether that permanent is tapped or untapped, whether it has any counters on it or Auras and Equipment attached to it, or any non-copy effects that have changed its power, toughness, types, color, and so on.
- 12 May 2023Once you choose to create a token using the last ability, that ability won't trigger again that turn. Additional instances of the ability that are already on the stack will resolve but will have no effect.