pokemon trading card game: mega evolution sleeved booster pack TCG: Evolutions - Perfect Order This product is designed for players aged 6 years and up Pokemon Mega Evolution Sleeved New

You would lose the game if Cloudsteel Kirin becomes unattached or becomes attached to a creature you don't control

You can see a review of the Prime X4 XL courtesy of Tolarian Community College below:

Placing all of the rare cards you've collected into a battle-ready deck is one of the most satisfying reasons to keep playing Pokemon TCG Pocket

This is allowed because technically after you destroy the Battle, you transform it, exile it, and then have the option to cast it without paying its mana cost

Played fairly I guess this might still slot in Jank but I think this is very much a real deck

All of that said, its also a card with a lot of printings