The main downside comes from the floor: Loot does nothing without a bunch of other permanents in play and gets a nice, fat target painted on its head whenever you cast it
Dragonite's next move is called Dragon Roar and for four energy cards, 2 grass, 2 colorless, does 80 hp damage every turn even if your opponent's active Pokemon needs only 20 hp to be knocked out the rest of the attack which would be 60 hp in this example could go towards any of your opponent's benched Pokemon in any way you like, you just can't knock out their benched Pokemon
if Yveltal-EX had at least three Energy attached, it was possible with a combination of Muscle Band and Hypnotoxic Laser / Virbank City Gym to take a OHKO
However, a sleeve alone wont prevent bending or creasing, so for high-value cards youll often combine a sleeve with a sturdier holder
Crowler duels Jaden in an attempt to stop him and his friends from graduating, even though he knows he needs to let them move on
Unless they have a way to draw, they wasted that mana, revealed that card, and can't play it this turn