Shrieking Titan Head

At the beginning of the Hydra's end step, each player discards a card.
Hero's Reward — When Shrieking Titan Head leaves the battlefield, each player gains 4 life and draws a card.

Noxious Hydra Breath

Choose one — Noxious Hydra Breath deals 5 damage to each player; or destroy each tapped non-Head creature.

Disorienting Glower

Players can't cast spells until the Hydra's next turn.

Strike the Weak Spot

Destroy target Head. If that Head was elite, the Hydra takes an extra turn after this one.

Snapping Fang Head

At the beginning of the Hydra's end step, Snapping Fang Head deals 1 damage to each player.
Hero's Reward — When Snapping Fang Head leaves the battlefield, each player gains 4 life and draws a card.

Neck Tangle

If there are five or more Heads on the battlefield, tap two of them and they don't untap during the Hydra's next untap step. Otherwise, reveal the top card of the Hydra's library and the Hydra casts that card.

Savage Vigor Head

At the beginning of the Hydra's end step, reveal the top card of the Hydra's library and the Hydra casts that card.
Hero's Reward — When Savage Vigor Head leaves the battlefield, each player gains 4 life and draws a card.

Distract the Hydra

Each player may sacrifice a creature. Each player who sacrificed a creature this way chooses a Head and taps it. Each player who didn't sacrifice a creature loses 3 life.

Hydra Head

Hero's Reward — When Hydra Head leaves the battlefield, each player gains 2 life.

Hydra's Impenetrable Hide

Each Head gains indestructible until the end of the Hydra's next turn.

Unified Lunge

Unified Lunge deals X damage to each player, where X is the number of Heads on the battlefield.

Ravenous Brute Head

Hero's Reward — When Ravenous Brute Head leaves the battlefield, each player gains 2 life and draws a card.

Torn Between Heads

Tap up to two Heads. They don't untap during the Hydra's next untap step. Torn Between Heads deals 5 damage to each player.

Swallow the Hero Whole

Each player exiles a creature they control. Until the Hydra's next turn, when a Head leaves the battlefield, return the exiled cards to the battlefield under their owners' control.

Grown from the Stump

Place exactly two cards named Hydra Head onto the battlefield from the Hydra's graveyard. If you can't, reveal cards from the top of the Hydra's library until you reveal a Head card. Put that card onto the battlefield and the rest into the Hydra's graveyard.