If they do, you'll still be able to cast a spell from their hand without paying its mana cost, but once Kuroki's ability finishes resolving, state-based actions will be checked and that opponent will (in most cases) lose the game since they attempted to draw a card from an empty library
The alternative is power creep, where new cards are always better, so old cards are always worse
You should also include all three guild signets that you can fit into your deck : Boros Signet, Orzhov Signet, and Rakdos Signet
II Zantetsuken This creature gains "Whenever this creature deals combat damage to a player, that player loses the game." III Hall of Sorrow Draw two cards
Every Card In The Amber & Ruby Disney Lorcana Starter Deck Azurite Sea Set Surprisingly, this is the first time that Amber and Ruby inks have been put together for a starter deck, although Amber is a generally versatile ink that works well with all types of decks