Yes, you can sue L & ask a court to declare the lease null & void OR to reinsert the old rental rate. You'll have a difficult standard of proof though. Did you initial every page? Can you show that L unstapled the signature page & restapled it to the new lease? (extra holes in 1 page)
You can sue L under 566.20, for "violating" the lease under 518.18(6)(c) by changing a material term after execution. You should do so immediately. When you sue L, take advantage of the rent escrow law. [566.34] The court will give you an affidavit form to fill out alleging the violation (changing a material term after execution). Thereafter, you pay your rent to the court. The court decides how much L gets. You'll have to pay the full rent given in the lease -- L can evict you if you don't pay the entire rent to the court. The court will set a hearing within 2 weeks & decide the case. Don't forget to ask the court to fine L under 566.35 if L doesn't do what the court orders him to do.
You also get to raise the issue that L didn't give you a copy of the lease until after he'd doctored it. This may have violated 504.015(2) & constitute a defense against L's claim that you have to pay the extra rent.
By the way, I predict you're going to have problems getting your damage deposit back. Document the initial condition of the apt meticulously with a date/time stamp camera or camcorder when you move in & move out. Send all repair requests in writing, certified, return receipt, & keep a log of when the repair is made. Have witnesses who can testify that the place had no funny smells when you left it.
Good luck.
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This is not legal advice and you are not my client. Double check everything with your own attorney and your state's laws.
