Mining a spawner with a silk touch pickaxe should drop a the spawner. but the spawner wouldn't work without a 5X5 mossy cobblestone floor beneath it, and any extra mossy cobblestone block added to the walls of the 5X5 cube would make it more efficient.
Also, the empty spawner block should be available in the creative inventory, and right-clicking it with a spawn egg will make it spawn that mob. Right-clicking an empty spawner with a spawn egg will make it go full powered without needing mossy cobblestone. the spawning speed of the spawner can be changed with BlockData.
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