You can continue tapping creatures to station it afterward, which wont boost the Sweeper itself, but it helps fuel several cards in the set that care about tapped creatures
This thing is great against everything from Aether Vial and Collected Company to Reanimate and Show and Tell-all for a single mana
Just imagine having Omen of the Sea, Peregrine Drake, Mulldrifter, Cloudblazer, and ten other ETB cards in play
Plus, it can pump your entire dragon team with a simple mana sink ability, making combat even scarier
but the controller needs to pay 2 mana to untap the creature
"Magic: The GatheringFINAL FANTASY: A Conversation with Tetsuya Nomura"