I’m not super sure about the mulligans, that’s always been the weaker parts of my game, but I think getting early minions to contest the board and use their effects to draw cards is generally what you want to do and dropping Reckless to pull off whatever shenanigans is typically pretty powerful. Reckless allows you to pull of the decks strongest plays. For example, if you play Reckless on five, it generally sticks and if it does you can do things on six like 3 mana Whelp, Embalming Ritual into Shadowy Figure to create two Whelps and two 7/7’s at the end of turn. If you have early minions Psychopomp can help you keep the board and either keep drawing if you resurrect a Cleric or Loot Hoarder or give you a target for a discounted Snip-Snap if you can hit Mecharoo or Dead Ringer.