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
Riley's been chosen to Turbo Duel Shinji, but the battle hits a speedbump when Yuya steps in to stop the duel and keep his pint-sized pal in one piece
If the biggest drawback you're looking at is three in the cost or that it is not legendary and thus cannot be your commander, that's a sign we have a bomb of a vampire
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
The point is just trying to build a stronger deck around the specific card, and any secret pack is designed to do exactly that
The theme synergizes with Level 5 or higher Warriors, mostly LIGHT and EARTH, though this is not the biggest or consistent pool of monsters to mix with