FOILCheapest priced copy (Dominaria United Commander): $2.49 at Card Kingdom, near mint, their price list as of .
Zaxara, the Exemplary 
Legendary Creature — Nightmare Hydra · 2/3 · Mythic · Secret Lair Drop · #1333
Deathtouch
{T}: Add two mana of any one color.
Whenever you cast a spell with {X} in its mana cost, create a 0/0 green Hydra creature token, then put X +1/+1 counters on it.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
3 printings · $1.49 to $24.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Commander 2020 | 20 | Mythic | $5.99 | $1.49 |
| Dominaria United Commander | 176 | Mythic | $2.49 | — |
| Secret Lair Drop | 1333 | Mythic | — | $24.99 |
5 rulings from Wizards of the Coast
- 17 April 2020The Hydra token enters the battlefield as a 0/0 creature. Any abilities that modify or trigger on this event apply. After the token is on the battlefield but before any player can take actions, +1/+1 counters are put onto the token.
- 17 April 2020If the spell you cast has {X}{X} in its mana cost, the token gets only X counters, not twice X.
- 17 April 2020If X is 0, the 0/0 Hydra token will die immediately after the ability's done resolving unless something else is raising its toughness.
- 17 April 2020The value of X in Zaxara's last ability is the value of X of the spell you cast.
- 17 April 2020If an effect, such as that of Parallel Lives, causes Zaxara's ability to create multiple Hydra tokens, they each receive X +1/+1 counters.