Monster in Hand, you can Summon one to your field while sending the other to the GY
That variety is absolutely incredible, and it all started with Aether Hub and Attune with Aether
Also, I'm not really sure of this but I think there would be an issue between this card and game mechanics to begin with, related to cards in the deck not being public knowledge: if I am not mistaken, as far as the game is concerned the card you draw may or may not be the same card you selected, even if you didn't modify the deck (shuffle, etc.) before drawing, which would conflict with this card's effect
More or less, it is another subset of cards, like Single Strike or Rapid Strike, and it allows some cards to work exclusively with each other
The biggest difference is in the cash-back rewards program