Originally Posted by
damionblackgear
I was leaving that one out of it for a reason. It's a common misconception but, you're not saving yourself anywhere near the amount of damage this is played to. Example, Lightning Bolt is 3 damage. If you take it with Thoughtseize, you've saved 1 damage. Fireblast is 2 damage. Your best hope is to take Price when you've been unable to play basics.
Even if you're taking something that does more that the Thoughtseize. there's no guaranteeing that they would've needed that card or that the 1-2 life you're saving is relevant. You also gave them 2 damage free of charge. If there's one thing that everyone's love of Force of will should have taught you in this matter, "Free is worth an extra card."
Thoughtseizing a burn deck (or deck with reach) is giving them an extra tool to win, You. Against those decks, both Duress and IoK are superior to Thoughtseize. Also, depending on the meta, that's also the reason to run a 3/3 split.
When Burn was doing well from all the new players at SCG, I ran IoK over Thoguhtseize (4/0). My sideboard card at the time was Duress. I played it that way because, at that time, there weren't all the different threats above 3. IoK dealt with all but about 4 cards in the format which were all part of already bad match-ups. In today's meta, there are decks designed to be able to last and use cards that cost 4+ to win the game. IoK is no longer able to get as much value as it previously did. Duress is more capable as an assist to the discard package.
-Edit- Did I ever mention how much I hate being the opening post of a page?