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 only during your upkeep.
NM-Mint - $57.60
Lightly Played - $51.90
Moderately Played - $46.10
Heavily Played - $40.40
Damaged - $28.80
NM-Mint Non English - $57.60
Lightly Played Non English - $51.90
Moderately Played Non English - $46.10
Heavily Played Non English - $40.40
Damaged Non English - $28.80