1. Play last will
2. Offer 2 monsters on the feild
3. Get out 2 monsters (thats how L.W. works, even check the official site)
4. Have the 2 monsters be cannon soldier and any card
5. Offer the other monster to do 500 damage, get another card because of L.W.
6. Repeat "step 5" 10-20 times to do 5000-10000 damage

note:
this combo follows all the rules, it WORKS. Last will works like that, and you can use an effect thats not a flip efect infinate times.

note:
wabaku blocks this.

This tip was sent by Pckid88@aol.com

Now I haven't been playing for very long so I may not know all of the rules, so if that's the case, completely disregard this. I have always thought that you could only send a monster from the field to the graveyard if it was destroyed by another monster or if you used it as a tribute. If this is the case, this combo should be that you have to have Cannon Soldier with another monster on the field FIRST. Play Last Will, then activate Cannon Soldier's effect. This I believe is the completly legal move, but again I may be wrong.