Mulligans
General Mulligans
Keep your low-cost minions in every matchup (except Attorney-at-Maw, which you should only keep against Paladin and aggro Priest). Keep Seedsman if you have Peaceful Piper or any two low-cost minions. Keep Seedsman with just one other minion if you're going second. Always keep Seedsman against Druid. Keep Rake against aggro if you have at least one low-cost minion.
This version of the deck only runs four cards over 5 mana, allowing you to very consistently draw the combo. ETC comes loaded with an extra Underking or Mish-Mash Mosher, with the third card being Smothering Starfish for emergency outs (like unfreezing your minions). The rest of the deck keeps a very low curve, allowing you to play for tempo until you combo.
Against control decks like Blood DK and Control Priest, aggressively draw through your deck to find Tony, and save armor to play Anub’rekhan, Tony, Jailer in one turn to destroy your opponent’s deck. (Keep your hand full until you combo to dodge Theotar, Dirty Rat, and Patchwerk.) Tony is irrelevant in other matchups and can be played for tempo if necessary.
I settled in top 5000 with this deck this season, with my highest rank being Legend #3119.