Community

Rock Hydra
Creature — Hydra
This creature enters with X +1/+1 counters on it.
For each 1 damage that would be dealt to this creature, if it has a +1/+1 counter on it, remove a +1/+1 counter from it and prevent that 1 damage.
red mana : Prevent the next 1 damage that would be dealt to this creature this turn.
red mana red mana red mana : Put a +1/+1 counter on this creature. Activate only during your upkeep.
Rulings (4)
You can activate the activated ability that prevents damage any time, even if no source seems likely to deal damage to you in the near future. It will prevent the next 1 damage that would be dealt this turn, even if that turns out to be much later in the turn.
Aug 1, 2008
If damage that would be dealt to Rock Hydra can't be prevented, you still remove a +1/+1 counter from it for each 1 damage dealt.
Aug 1, 2008
Once on the battlefield, the X is considered to be zero when calculating its mana cost.
Oct 4, 2004
Legality
Formats by platform
Commander
Competitive
Community & retro
Printings (11)
ME4#133—
Masters Edition IV
30A#167—
30th Anniversary Edition