Cyrus forces the opponent to switch in a damaged Pokemon so we can then have Darkrai ex or Weavile ex finish the job
The number of "oops, I died" moments when an effect like this is on the 'field skyrockets
was created as a manga (Japanese comic book) by Kazuki Takahashi in 1996 and was originally named Magic and Wizards which was a play on the popular (and very Satanic) card game known as Magic: The Gathering (you can read more about this game here)
He called monster with it, and Dawson used Time Pendulumgraph , destroying his Black Fang and Resort
Overall, I would say I am pro-sleeving if the game gets to the table often or is played around particularly messy audiences, but I completely understand some peoples apprehension with the idea of sleeving all games
Of course, one of the cool things about this card is that you dont always need it to be that perfect game winner it can effectively be a board wipe in the early stages, or just a value play later on if you can sacrifice your board before you slam it