Shrieking Mill

Flying When this creature enters, return a creature you control to its owner's hand.

Sacrifice a creature: Add one mana of any color.

Whenever a nontoken creature enters, if this artifact is untapped, that creature's controller creates a 1/1 colorless Myr artifact creature token.

Whenever this creature or another Ally you control enters, target player mills X cards, where X is the number of Allies you control.

As this enchantment enters, choose a creature type. Each creature you control is the chosen type in addition to its other types.