This is the first useful retrain of Pot of Greed that lets you return five monsters from your graveyard to your deck in exchange for drawing two cards
The point is just trying to build a stronger deck around the specific card, and any secret pack is designed to do exactly that
Yumas deck is without a doubt one of the most talented players of his generation, with amazing cards by his side to help him win the toughest of opponents
After doing so, you'll be sent to your card collection to pick the card for trading
Being a mono-colour snow deck means you get to activate Faceless Haven more reliably due to your manabase not being muddied with non-snow lands such a Pathways, and enables you to play the full four copies of Haven without leading you to having too few coloured mana sources
Your opponent chooses 1 random card in your hand and calls the card type (Monster, Spell, or Trap), and if they call it wrong, return the attacking monster to the hand