Cheapest priced copy (Teenage Mutant Ninja Turtles Eternal): $0.59 at Card Kingdom, near mint, their price list as of .
Voracious Hydra 
Creature — Hydra · 0/1 · Rare · Core Set 2020 · #200
Trample
This creature enters with X +1/+1 counters on it.
When this creature enters, choose one —
• Double the number of +1/+1 counters on this creature.
• This creature fights target creature you don't control.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
6 printings · $0.59 to $27.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Core Set 2020 | 200 | Rare | $3.99 | $10.99 |
| Core Set 2020 Promos | 200p | Rare | $7.49 | $10.99 |
| Core Set 2020 Promos | 200s | Rare | — | $8.99 |
| Secret Lair Drop | 1491 | Rare | $23.99 | — |
| Secret Lair Drop | 1491★ | Rare | — | $27.99 |
| Teenage Mutant Ninja Turtles Eternal (Aggro Amalgam) | 54 | Rare | $0.59 | $2.49 |
2 rulings from Wizards of the Coast
- 12 July 2019Because fighting isn't combat damage, trample has no effect during the fight.
- 12 July 2019If the target of Voracious Hydra's second mode isn't a legal target as the ability resolves, or if Voracious Hydra has left the battlefield, neither creature will deal or be dealt damage. The ability won't change to the first mode if the target is illegal.