@ mercs:
Golem and Phoenix could work against black, but when you play vs. 4 Sinkholes,etc., it's hard to reach even 4 mana. And he won't make you discard your Phoenix. Unless you wait for a Raider (unreliable plan), Phoenix will sit tight in your hand for a long time. Plus...will you have 3 artifacts down to activate the metalcraft ability? I also tried to leave at least 1 SB slot against those black decks you mention. Goblin Assault works very well, if you're lucky and hit your 1-2 copies!
As for the largest creatures, read Tacosnape's first post in page 131 guys..Blasts hit Show and Tell. 4 Crypts/Faeries and Chalices can stop Reanimators (Iona) long enough for you to do your dirty job. And your resolved hellbent dragons of course are faster. Also accept that you can't always win, especially when you don't play first=)
In addition...vs. Emrakul, Progenitus & company...if on the play, I play a first turn Moon and/or a chalice @ 0. No colored mana, no moxes for him(and later for you also, but just make this sacrifice), no lotus petals = no green mana => no Eureka. And Pithing Needle stops Sneak Attack.
EDIT: Would you play Pyroblast... in order to be able to target any spell or permanent; and so to be able to get rid of it and reach hellbent anytime?
Or Red Elemental Blast which is immune to Misdirection and stupid stuff like that? Remember that we play Trinispheres which hurt Misdirection anyway. On the other hand think that we would sideboard in the Pyroblasts only against blue, so I don't know if finding a random target to empty our hand is really a problem. Maybe against decks splashing 1/3 blue it could be.
For the ones who think I'm raving in chinese, read the second paragraph here:
http://www.wizards.com/magic/magazin...gcom/daily/bb4