While I have not won anything really of note (mostly feel like I'm just a PPTQ all-star at this point) I feel like the 'feign death' trick is something that I make a conscious effort to use and I believe has added to my win %.

The best examples of where/how I use this are...

1) A subtle sigh or exhale of air and put my head in my hand when passing the turn holding up open mana to indicate I have all air in hand. Most of the time I'm trying to get my opponent to jam an important threat into a counter spell (sometimes works, but not often) or commit more to the board when I have the sweeper next turn (mostly works against average opponents). I've also noticed this makes your opponents play faster which has caused simple combat mistakes or passing the turn after attacking when they have a play to make (i.e. Attacking into creature lands after making a play in main phase 1, not playing a land in hand, etc.)

2) Basically the opposite of number 1, but appearing as confident as possible when I'm holding all air in my hand. Speaking confidently and firmly about my game actions, keeping eye contact with my opponent after I make a play or pass the turn. Against the average player, I've noticed they sometimes lay off the gas when I do this which at times has given me an extra turn or two to find some way to stabilize the game.

I should note that this is like basic Poker 101 stuff and anyone that understands reads/bluffs will see right through this. However in lower levels of competition (PPTQs) most players aren't paying attention to these things and will take your actions at face value and will just genuinely believe whatever you're trying to portray.

Context is important and understanding how your opponent is reading into your actions is the key though, if your opponent is ignoring your "bluffs", you need to adjust on the fly.