Mask of Intolerance [Apocalypse] Ogre Set: Savage Strike Card type:

Set: Savage Strike Card type: Tuner/Effect Monster Rarity: Rare Attack: 0 Defense: 0 When this card is Normal Summoned: You can target 1 Level 5 or higher DARK Dragon monster in your GY

Orzhov servants collect them to make altar chimes

that specifically lists the card "Gaia the Dragon Champion" in its text

its ATK becomes equal to the combined original ATK of all "Ghostrick" monsters currently on the field

Mask of Intolerance [Apocalypse] Ogre Set: Savage Strike Card type:Set: Apocalypse Type: Artifact Rarity: Rare Cost: {2} At the beginning of each player's upkeep, if there are four or more basic land types among lands that player controls, Mask of Intolerance deals 3 damage to that player.