The basic idea of the Sky Striker strategy is using one main monster, Sky Striker Ace Raye, that can change into many different forms
If it states Glimmora ex on the card as its name, as the above cards all do, then you can have a maximum of four of them in your deck
Greninja ( Genetic Apex ) and Jolteon ex ( Mega Rising ) can both damage the opponent's Bench with their ability: Greninja has the Ability Water Shuriken, where once during the player's turn they can deal 20 damage to one of the opponent's Pokmon, including Benched Pokmon, and Jolteon ex has Electromagnetic Wall, which deals 20 damage to an opposing Pokmon - including Benched Pokmon - when the opponent attaches Energy from the Energy Zone to that Pokmon
Typically, the newer cards dont tend to be worth much, since they are easily found on the market, making it simple for collectors to find cards to complete their set