Jeor of Earst

Morph {3}{g/u}{g/u} (You may cast this face down as a
2/2 creature for {3}. Turn it face up any time for its
morph cost.)
Changeling (This card is every creature type)
When Jeor of Earst is turned face up, choose a
creature type. Creatures of the chosen type cost
{1} less to cast. Any creature type that falls within
the category of a reptile, bird, or non-human
mammal cost {2} less to cast.