All raptors are aggressive, but ferocidons seem to enjoy their prey's pain.

Rampaging Ferocidon

Menace
Players can't gain life.
Whenever another creature enters, this creature deals 1 damage to that creature's controller.

Duskmourn: House of Horror Commander

Menace
Players can't gain life.
Whenever another creature enters, Rampaging Ferocidon deals 1 damage to that creature's controller.

Secret Lair Drop

Unlike their pack-hunting kin, ferocidons stalk in solitude and lash out at everything that approaches.

Special Guests

Menace
Players can't gain life.
Whenever another creature enters the battlefield, Rampaging Ferocidon deals 1 damage to that creature's controller.

Ixalan Promos

If an effect says to set a player's life total to a number that's higher than the player's current life total while Rampaging Ferocidon is on the battlefield, the player's life total doesn't change.

If another creature enters the battlefield at the same time as Rampaging Ferocidon, its last ability triggers.

Rampaging Ferocidon's last ability triggers whenever any player has a creature enter the battlefield, including you.

Spells and abilities that cause players to gain life still resolve while Rampaging Ferocidon is on the battlefield. No player will gain life, but any other effects of that spell or ability will happen.