Congrats! As have I. I will continue to give you what you asked for: good ideas. I won't hold your hand as you press the blow-up-the-game-with-disruptive-behavior button. Because I don't think that's a good idea (again, the thing you asked for in the title of this thread).
A few important thing for everyone still reading along to remember, from the OP:
"...the DM is allowing me to extract my revenge..."
"...[the DM] is willing to help me out provided i come up with a plan of execution so that him and i dont need to pass notes in the middle of the session and let everyone know that i killed him so he does not try to hold a grudge."
Two things especially stand out here to me:
1) Despite claims later to the contrary, you are clearly expressing a personal desire to do this thing. Indicated by you saying, "the DM is allowing me to extract my revenge," and "the DM is willing to help me out." You should look inward at the fact that it was you who got your first PC killed. Refusing to work with the other players at the table to tell a fun story, you used the crutch of "metagaming" to play secretive games with the party dynamic and it bit you in the behind. But then you willingly bite into that same "metagaming" apple to excuse petty behavior.
2) If the paladin's player finds out it was you, the belief is he will be upset. As evident by you saying no one can know if was you, "so he does not try and hold a grudge." Well, what happens after you commit this murder and the rest of the party decides to stop at nothing until the assassin is caught and punished? What happens when they find out it was you? Do you not consider that a possibility? Well, you should.
A few important thing for everyone still reading along to remember, from the OP:
"...the DM is allowing me to extract my revenge..."
"...[the DM] is willing to help me out provided i come up with a plan of execution so that him and i dont need to pass notes in the middle of the session and let everyone know that i killed him so he does not try to hold a grudge."
Two things especially stand out here to me:
1) Despite claims later to the contrary, you are clearly expressing a personal desire to do this thing. Indicated by you saying, "the DM is allowing me to extract my revenge," and "the DM is willing to help me out." You should look inward at the fact that it was you who got your first PC killed. Refusing to work with the other players at the table to tell a fun story, you used the crutch of "metagaming" to play secretive games with the party dynamic and it bit you in the behind. But then you willingly bite into that same "metagaming" apple to excuse petty behavior.
2) If the paladin's player finds out it was you, the belief is he will be upset. As evident by you saying no one can know if was you, "so he does not try and hold a grudge." Well, what happens after you commit this murder and the rest of the party decides to stop at nothing until the assassin is caught and punished? What happens when they find out it was you? Do you not consider that a possibility? Well, you should.