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These are cards that can remove other cards from the field without specifically targeting a monster, meaning regardless of what your opponent has, youll be able to deal with

Crucially, starting an engine is a state-based action that happens as soon as you control a permanent with the ability, making it exceptionally difficult for an opponent to interact with via the stack

I cannot stress this enough about modern Yu-Gi-Oh

The opponent cannot respond to this card's effect with card types that were sent to the graveyard with this card's effect

Well, apart from the fact that red LEDs were cheap back in 2001oh, and blue LEDs didnt even exist back thenit was also to help make sure the device got a nice, clean scan