Pikachu ex and Latias ex are the two most expensive cards in the set, and they are both played in the Miraidon ex/Electric Toolbox deck, so players can expect to see them for a long time, as the deck will likely stay around after the Apr
The cost is a big one, five mana is a lot
That gave the deck a very strong competitive profile because it could pressure while still controlling the opponents field, which is the kind of balance black leaders need to survive across multiple formats
Simba: Protective Cub can follow up Lilo on the second turn of a game as a cheap bodyguard card, forcing opponents to target him instead of Lilo until he's banished
These cards have been highly sought-after by collectors for decades, with one of the rarest modern-day cards sold for a record amount in a game of rock-paper-scissors according to Dicebreaker
Dockside Extortionist is good