Below is a transcript of my series of 
  e-mails with CXVance on the subject 
  of the Last Will Question.   --J-Rob   
  
  How many times can last will be used 
  in a turn. It says that it work for one 
  turn and is not discarded until the end 
  of your turn. It also has no limitation 
  on how the card is sent to the graveyard. 
  So could it be used to help speed up 
  summoning creatures by tributing and 
  getting a card back then sacrificing the 
  next card to bring out a creature? Then 
  could it be used in conjunction with a 
  cannon soldier, catapult turtle or little 
  swordsman of aile to take out the opponent 
  in 1 or 2 turns? I would just like to know 
  if my deck has been illegal all this time. 
 
CXVance@aol.com

  On UpperDecks website there is posted this 
  specific ruling on last will.  
 
Last Will

  Q: What is the significance of "this card 
    is active for one turn only?
  A: This means that "Last Will" is destroyed 
    after activation. However, the effect remains 
    during that turn. You can activate "Last Will" 
    before your monster is sent to the Graveyard. 
    This card is useful against opponent's Trap Cards 
    such as "Mirror Force".

  Q: When 1 monster is sent from the field to the 
   Graveyard, can I Special Summon 2 monsters from 
   my Deck by activating 2 "Last Will" cards?
  A: Yes, you can.

  I derive from the  "can I Special Summon 2 monsters 
  from my Deck by activating 2 "Last Will" cards?"
  and the answer "Yes, you can." that you have to 
  activate 2 last wills to get that effect. This is only 
  my oppinion and could be wrong but if asked I would 
  have to rule it that way.
 
  yours truly,
     J-Rob, Webmaster of Yu-Gi-Oh C.O.P.

  

  Thanks for your help but i don't think I was 
  very clear with how I use last will with cannon 
  soldier/ catapult turtle/Little swordsman. Using 
  ultimate offering I summon cannon soldier/ 
  catapult turtle/Little swordsman and 1 more monster. 
  I sacrifice that creature to either deal direct 
  damage or power up my card by 700 depending on 
  which card I am using. Then by using last will I get 
  another monster on the field to sacrifice again for 
  either more direct damage or another 700. My deck 
  has 25 monsters andeach are under 1500 so I can 
  summon them all with last will. That leads to either 
  12,500+ direct damage or a 17,500 ATK monster. I win 
  in at most 3 turns each time. Is that usage, while 
  definately unfair, legal?   --CXVance

  

  As for the catapult turtle thing you could do direct 
  damage with 1 monster, last will out another one and 
  fling away (my term) that one too to get another 
  lifepoint damage, but as far as it is concerend, Last 
  Will is destroyed after it's one use, the term "Last 
  Will is active for one turn only" means if none of your 
  monsters are destroyed durring the turn you play it, it 
  is destroyed.
 
  I hoped I explained it clear enough, if you have
  any questions feel free to E-mail me back.
 
  yours truly,
  J-Rob