Morophon, the Boundless

Changeling (This card is every creature type.)
As Morophon, the Boundless enters, choose a creature type.
Spells of the chosen type you cast cost {W}{U}{B}{R}{G} less to cast. This effect reduces only the amount of colored mana you pay.
Other creatures you control of the chosen type get +1/+1.

Sage's Row Denizen

Whenever another blue creature you control enters, target player mills two cards.

Shrieking Drake

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