Ok, This is actually more of a Hypothetical Question for all of you here. I was looking up commander deks, when I noticed that this one deck had the above 3 cards. So then, suppose I have all cards on the table. And suppose its a multiplayer FFA game. And lets pretend each player has 5 powerful creatures on board as well!! Ok, so how many creatures are actually allowed to attack?? Which card's ability wins out? Arbiter? Melee? Plans? hmmm....  

First, drop the Tangle Asp. Then, on the turn it can attack, drop the plans and swing with everything. Since you control what blocks what, assign all blockers to the snake, which will result in all of them dying at the end of combat, and the rest of your army going through unharmed.

The Infiltration Lens is not essential, but a good way to refill your hand with the plans.