Battle of Coruscant

You may cast Battle of Coruscant as if it was an instant.
Pay {w}{u}{b}{r}{g} or {p/b}{p/c}{p/g}{p/r}{p/u}{p/w}. When you do, generate 5 Galactic Empire cruisers which are all 6/6's. (You may only use this ability once.)
Every attacking phase, all creatures gain mountain walk, forest walk, island walk, plains walk, swamp walk.