This is a first in the game, and Im desperately hoping they continue with similar ideas
Excava, the Risen Past operates under a similar restriction, with the added limitation of only returning Artifacts, Creatures, or Auras
Or maybe we cast stuff from the top of our own library
Energy Production Most of the cards that use energy also produce energy, allowing you to generate and spend it as you go, but it's also a good idea to have some ways to stockpile energy for later use
Dueling Nexus Players, welcome, this deck is called Trains
Spell - Quick-Play Add 1 "Kewl Tune" card from your Deck to your hand, except "Kewl Tune Synchro", then immediately after this effect resolves, you can Synchro Summon 1 Tuner Synchro Monster