One of the tricks R&D uses is to put multiple cards in the same card code slot as a way to say "These cards cannot both go into the set so we're trying them out." This keeps the lead designer from constantly getting comments that the cards are too close
Testing is about learning why your deck wins and loses
The mechanic explicitly doesnt care what happened to the first spell it may have resolved, been countered, or even still be on the stack
It even works well alongside Oketra the True, quickly adding up the much-needed body count
For all the confusion surrounding it, I believe its fairly simple, and this article will attempt to clarify it for you
Centred around the titular card, the deck aims to discard Psychic Energy rapidly with any effects available, but mainly Kirlia SIT, which features the same ability of discard 1, draw 2 thats earned Reklev many of his accomplishments in the game