Hearthpwn

Keys to spoiling Paladin and Priest efforts by ruining their enchantments.  Tinkmaster Overspark is also key to ruining Deathrattles and hurting resurrections pools (good in the mirror vs. Envoy Rustwix).

is helpful against Rogue and Hunter, a must against Mage (along with Zephrys the Great).  You could sub Eater of Secrets, but its more matchup situational, where the Chief Inspector is consistently statted even in secretless matches.

is underappreciated... this is great in the mirror.  Good to play on turn 5-7 against Warlock trying to catch Tickatus before he is corrupted. Similar strategies apply against other classes, where you try to force a card out at less than optimal timing for them.

each mess with the opponent's timing, forcing their board into states our removal can usually handle and depriving them of key battlecries.  Deathlord also impacts their deck card count toward fatigue marginally.  While Dirty Rat can be played early, often best timed for one mana before the card you want to pull can be cast , to increase the odds of it being in hand.

is self explanatory... supports our fatigue win cons and may destroy a combo or eliminate a key threat.

More deck disruption, key against Jade Druids and helpful against some other builds. Helpful if played before other deck destruction to get rid of all 1 cost spells, so that later deck destruction is more efficient, but don't let it keep you from playing to what you draw.  This is always a keep on mulligan against Druid, obvs.

joins our Screwtape Letters cast and crew to hose the enemy with his wide range of options.  His 10 mana recipes are key against Priest and Paladin, but don't overlook the 1 and 5 mana recipes. 

is our out where when we don't have other things covered... he is our sole source of outright weapon removal, our second source of secret removal, our only access to Hex or Mass Dispel and a great finisher.

can slow their roll and enhance yours.

can not be overlooked as a secret tester against wielders of concealed arcanery.