Same as some others above, Archmage Arugal (for a few games until I figured out Minion Mage is really not that fun or strong) and Lakkari Sacrifice (played a bit more, was even fun trying to get it to work, but... it doesn't really work)
Loved highlander decks, loved warlock, loved demons. Just had to make a renolock based around demons. Back then, demon based warlock decks kinda sucked. Now, Skull of the Man'ari does what Krul the Unshackled did but much better, namely, pulling out demons you prefer not to play from hand, like Doomguard.