While I dont personally feel the need to have my Planechase sleeves in a top loader, I do for my AFR Dungeon room oversized cards
Once you get Legendary Pokemon that can bend space and time, communicate telepathically, control the weather, bestow eternal life, and literally create the universe, the bird trio kind of pale in comparison
3UU Legendary Creature Human Designer 2/2 You may play cards as though they were other cards of your choice with the same mana cost
However, if a Weezing or a Muk are afflicted with Sleep, you can use the supporter card Koga to force them to return to bench
One day they could come off the banlist and made into Game Changers, but I hope it never comes
If you have a way to cheat it into play on an opponent's turn, say with a Master Transmuter, you can watch your opponents over commit to the battlefield just to disrupt all their plans