Katcha-ta, The Rippling Winds

Haste, Flying
When placed on the field all creatures gain haste until he is destroyed or exiled. His power increases by +1 for every Mountain that is on the field.
If Elris, The EdgeMaster is on the field Katcha-ta, The Rippling Winds and Elris, The EdgeMaster gain double attack as long as you control both of the cards.