Shrieking Titan Head [Theros Face the Hydra] SM37 but I didn't expect it

but I didn't expect it from the building itself

Set: New Phyrexia Prerelease Promos Type: Artifact Creature — Phyrexian Shapeshifter Rarity: Rare Cost: {3}{U/P} ({U/P} can be paid with either {U} or 2 life

Whenever Uro enters the battlefield or attacks

Set: International Collectors' Edition Type: Enchantment — Aura Rarity: Uncommon Cost: {2}{U}{U} Enchant creature

Shrieking Titan Head [Theros Face the Hydra] SM37 but I didn't expect itSet: Theros Face the Hydra Type: Token Elite Creature Head Rarity: Common 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.