Rampaging Ferocidon

Set
Ixalan Promos
Rarity
Rare
Text
Menace Players can't gain life. Whenever another creature enters the battlefield, Rampaging Ferocidon deals 1 damage to that creature's controller.
Legality
Legal in: Brawl, Commander, Duel, Legacy, Modern, Penny, Vintage
Banned in: Standard
Rulings
2017-09-29: 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.

2017-09-29: 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.

2017-09-29: Rampaging Ferocidon’s last ability triggers whenever any player has a creature enter the battlefield, including you.

2017-09-29: If another creature enters the battlefield at the same time as Rampaging Ferocidon, its last ability triggers.