So, what are some cunning techniques you can use to play with the mind of the other player?

Like, for example, when I play blue I always keep 2 blue lands untapped even when I have no counterspells in my hand and everytime someone casts a spell I start puling out a card as if I'm going to counter, but then I act as if I've decided not to.

Against blue, of course, you would play your bait spells - ie you play a spell that you WANT other player to counter so that you can play your REAL spell.

Anyway those are the ones I can come up right now but would like to hear suggestions on other fun stuff