1. For the tournament I was trying to figure out where to squeeze in the numbers for another one. However, as the board's pretty full I'd find it hard to go for more than 2 Pithing Needle. It hits a ton of things yes, but you only really need it in a few matches. Four of them would be overkill, but I think if you cut a Boil for one you could still retain a good match for most of those blue match-ups. I just really enjoyed Boil against U/W landstill so I'd prefer to keep it in. It's possible that I was lucky in not running in to as many Engineered Explosives during the day. Chalice of the Void also seems to slow down/shutdown some of the better Needle targets anyway. Because there the slots are so tight you want to realize where the deck overlaps in its capabilities.
2. Chartooth Tiger seems to be too slow, as the extra land is to be more consistent, not to slow the deck down. To play him efficiently, you'd have to play him turn one off of an Ancient Tomb or the like. As you'd rather do other things that turn you're really setting yourself back to use him. I understand that it'd another body for late game, but the threats already available seem to do the job well. I also rarely would hit six mana, which is why I never really enjoyed having Akroma or SoFi in my hand, as to equip or morph it takes up another turn of my resources when really all I want to do is get hellbent (which simply playing a mountain off the top will do).
