Pick up souls from the creature and turn them into spawners.

Current Features:

• Soulstealer enchantemnt (available in book or from the enchantment table)
• Mob Shard (Host soul of all mobs)
• Upgrade with an altar (1 Lodestone and 1 soul)
• Spawners loot an empty spawner with Silk Touch
• The Spawner reacts to the redstone (Drop a redstone dust on it to activate the redstone control)
• Survival and Multiplayer friendly
• The spawner has no conditions to spawn mobs
• Low lag

How it works:

• Make Altar (1 Lodestone drop 1 Soul on it).
• Craft an Empty Shard (1 Emerald, 4 Glowstone Dust and 4 Tinted Glass).
• Enchant a sword with SoulSteal (I to V).
• Kill mobs with the Soulsteal Sword.
• Left clic with an Empty Shard in the middle of the altar.
• Left clic with an Soul(s) in the corners of the altar.
• Level up your Mob Shard to Tier 1 with 128 Mob Soul (Same mob of Shard).
• Mine Spawner to get it (Need Silk Touch).
• Drop your Mob Shard Tier 1 Min. on Spawner and voila.

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Old Video with old altar: