Hybrid Token Druid (Scholomance)

Keep these cards if they show up in your starting mulligan no matter what. Situationally, keep coins if you already have a Gibberling or Overgrowth, keep Adorable Infestation if you already have a Gibberling (or perhaps other minions), and keep Guardian Animals if you already have Overgrowth.

When playing the deck: Don't be afraid to play out your hand early and trust you'll draw into reload. Don't keep cheap spells for several turns in hopes of getting more Exotic Mountseller value, unless those spells can't generate much value otherwise. Usually it's better to trade into your opponent's board than go face, unless you have a clear road to lethal in a turn or two.