As the name implies, this format is what is most up-to-date and used in league tournaments
In the OCG, this is replaced with an OCG-only Quick Effect of Numeron Wall, where it can be sent from the hand or field to the Graveyard while the controller controls no cards, and activate a Numeron Network from the hand or deck
Your cards function should determine the type of stock you choose
Lastly when your deck needs life gain you are likely a control deck or a very grindy deck
During the End Phase, if this card is in the GY because it was sent there this turn: You can target 1 Machine monster in your GY, except "Super Express Bullet Train"
On the other hand, if your friends do force you to really tear Blacker Lotus into pieces, this may be an expensive one-trick pony