Mulligans
Abyssal Enforcer is decent to fill out mana curve, and is great vs shamans
Burgly Bully fills the empty 5 drop slot in handlock, plus it refills your hand vs aggro, and it gives Lord Jaraxxus synergy in the form of The Coin. It also is a semi-sticky minion, as killing it often give us something useful.
Defender of Argus is useful, but it is a bad play on turn 4, and usually only great in synergy with Brann Bronzebeard.
Netherspite Historian is only run one-of, since it’s not a perfect two drop, and we have enough late game with Lord Jaraxxus already.
Ragnaros the Firelord is not used over Sylvanas Windrunner because it’s too random, and the burst cannot be combo-d with many other damage cards.
Shadowflame is worth considering, but it’s often too clunkly in hand without Ancient Watcher NOTE; Shadowflame plus giants can be a game winning combo.
Good Luck! 😀