30th Anniversary Edition

Rock Hydra

Rock Hydra enters with X +1/+1 counters on it.
For each 1 damage that would be dealt to Rock Hydra, if it has a +1/+1 counter on it, remove a +1/+1 counter from it and prevent that 1 damage.
{R}: Prevent the next 1 damage that would be dealt to Rock Hydra this turn.
{R}{R}{R}: Put a +1/+1 counter on Rock Hydra. Activate only during your upkeep.

Masters Edition IV

Rock Hydra enters the battlefield with X +1/+1 counters on it.
For each 1 damage that would be dealt to Rock Hydra, if it has a +1/+1 counter on it, remove a +1/+1 counter from it and prevent that 1 damage.
{R}: Prevent the next 1 damage that would be dealt to Rock Hydra this turn.
{R}{R}{R}: Put a +1/+1 counter on Rock Hydra. Activate this ability only during your upkeep.

Summer Magic / Edgar

Revised Edition

Put X +1/+1 counters (heads) on Hydra. Each point of damage Hydra suffers kills one head unless controller spends o
R per head. During controller's upkeep, new heads may be grown for o
Ro
Ro
R apiece.

Foreign Black Border

Collectors' Edition

Intl. Collectors' Edition

Unlimited Edition

Put X +1/+1 counters (heads) on Hydra. Each point of damage Hydra suffers destroys one head unless o
R is spent. During upkeep, new heads may be grown for o
Ro
Ro
R apiece.

Limited Edition Beta

Limited Edition Alpha

Put X +1/+1 counters (heads) on Hydra. Each point of damage Hydra suffers destroys one head unless R is spent. During upkeep, new heads may be grown for o
Ro
Ro
R apiece.