Mulligans
Crystalline Oracle Mind Vision Drakkari Trickster Thoughtsteal Seance Give you cards from your opponents deck, while Bone Drake Elise the Trailblazer Stonehill Defender Shallow Gravedigger Seance
Once your hand is filled with minions that your have discovered and collected from your opponent, Princess Talanji comes in and summons them all! If you needed to play the cards you have collected earlier turns, then save the Pack from Elise the Trailblazer and open it then summon Princess Talanji.
For defence, Mass Hysteria and Spirit Lash are decent board clears, and Stonehill Defender is great against spam. Mass Dispel can get rid of annoying buffs and taunt creatures and also draws an extra card
Drakkari Trickster gives your opponent a card from your deck as well though, so try not to give them Elise the Trailblazer or Stonehill Defender. The best card you can give them randomly is Drakkari Trickster itself, or Princess Talanji, as they have no use for it!