Oh, that's an interesting tool!
My choices
My thoughts:
3. I know Berserker is great, but i wanted more minions and board control and imp is good with it, it also synergies well with Rampage, which i took earlier

5. I know its not great, but i wanted some taunter and 5 mana card
7. Because, it not only synergies with those enrages, but all deals with all that stupid 2/1, 3/1, 0/1 crap that is in openings of many Hunter/Shaman/Rogue decks

12. Yep, i know, but i just wanted more board control minions, and two minions is better than one

13. Didnt choose Spiteful Smith, because i didnt have any weapon and do know if affects Heroic Strike
14. I wanted something stronger and Elemental is just great

15. It was dilemma for me as well, but i didnt see weapons and its great substitute

17. I love Gnome, i've seen tons of good value from this card and Tiger even if good, can be killed by every minion and spell, where Gnome even if killed deal damage to enemy

18. Got Charge, because i was thinking that i'll get Windfury + buffs finisher in late game from time to time.
19. Yeah i know, i was thinking about Silence, but i got silence already and didnt have Windfury and wanted it for combo with Charge
23. Kripparrian convinced me to MCT
26. Wanted something for end-game.
30. Got Kodo instead of Mortal, because deck already had quite many cards to deal with lower life values, but not much with high values and those quite often pared with low attack values, especially taunts
