Phyrexian HydraHow it works & interactions with other cards

A Shield Made of Counters

Phyrexian Hydra features a static replacement effect that modifies how it takes damage. Instead of marking damage on the creature, the damage is prevented entirely and replaced by an equal number of -1/-1 counters. Because this is a replacement effect rather than a triggered ability, the counters are placed on the creature immediately as the damage would have occurred, and it does not use the stack.

The Infect Advantage

While the Hydra suffers -1/-1 counters when hit, it dishes out its own form of permanent misery. With Infect, it deals damage to creatures as -1/-1 counters and to players as poison counters. This means it can shrink blockers to survive combat, and it only needs to connect for 10 total damage to a player to end the game, regardless of their life total.

Common Pitfalls

It is important to remember that if an effect states damage 'cannot be prevented,' Phyrexian Hydra's ability is bypassed. In such cases, the Hydra takes normal damage and does not receive -1/-1 counters from its own ability. Additionally, if the Hydra is dealt damage greater than or equal to its current toughness, it will be put into the graveyard for having 0 or less toughness as a state-based action immediately after the counters are placed.

Strategic Deployment

Play Phyrexian Hydra when you can force your opponent into unfavorable blocks. Since it effectively has 'super-wither' via Infect, it can trade favorably with much larger creatures by weakening them permanently. However, be wary of 'ping' effects; multiple small instances of damage will whittle it down just as effectively as one large strike.

Interaction examples

Combat with a Golem

Solemn Simulacrum

If Phyrexian Hydra (a 7/7) is blocked by Solemn Simulacrum (a 2/2), the Hydra deals 2 damage to the Golem in the form of two -1/-1 counters, killing it. Simultaneously, the Golem would deal 2 damage to the Hydra. The Hydra's ability prevents that 2 damage and places two -1/-1 counters on itself. The Hydra survives as a 5/5 creature.

The Poison Clock

Poison Counter

When Phyrexian Hydra attacks a player and is not blocked, it deals 7 damage. Because of Infect, the player does not lose 7 life; instead, they receive 7 Poison Counters. If that player reaches a total of 10 Poison Counters, they lose the game immediately.

Tribal Synergies

Roaming Throne

If you control Roaming Throne with 'Hydra' chosen as the type, it is important to note that Phyrexian Hydra's damage-replacement ability is a static effect, not a triggered ability (it uses 'If... would... instead' language). Therefore, Roaming Throne will not cause the Hydra to gain double the -1/-1 counters. However, if a Hydra with a triggered ability like Polukranos Reborn dies, the Throne would double that death trigger.