Faithless Looting , Faithless Salvaging , Cathartic Reunion , Burning Inquiry , Gamble , Thrill of Possibility , and Unexpected Windfall make up the bulk of our card draw setup
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Another sneakier tactic would be to have ways to return the rat ninja to your hand to utilize its ninjutsu ability later in the game
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For the former, you can use Coastal Piracy to have tokens available for defence after each unblocked attack, any card drawn can be combined with Mystic Redaction, Sphinxs Tutelage or Psychic Corrosion, the Mystical Tutor and Solve the Equation help us find the right cards for any strategy, for example Time Warp, Pyromancers Goggles or Swarm Intelligence (matching the Commander)