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You're not even spending a card with flashback, and the 10 mana can be generated via cards like Nykthos, Shrine to Nyx or Nissa, Who Shakes the World

Does it require any other cards to work well in a battle

Well with Sigarda's Aid, Hammer of Nazahn, or Puresteel Paladin it's godly, especially with Puresteel Paladin(draws on enter not cast.) It's just wow with those cards but if I don't hit those it's eh mana intensive

How does that work exactly

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Kutzil, Malamet Exemplar Kutzil, Malamet Exemplar is a hatebear (the 3-mana kind, though) that also generates advantage whenever one of your buffed creatures deals damage to a player