Ceruledge
Tier 1
Aggro
Expanded has always had a place for aggressive decks that rely on Basic Energy, which makes them harder to disrupt. Ceruledge ex is currently the most effective among these decks. By drawing and discarding Energy with cards such as Fiery Flint, Heat Factory Prism Star and Battle Compressor, it is possible to build Abyssal Flames' damage very fast. Then, Ceruledge only needs one Basic Energy to attack, which is very easy to find. This means that disruptive cards, whether they're hand disruption (Iono), Item lock (Noivern-GX), Ability lock (Garbodor), etc., won't be very effective as Ceruledge will only need to attack over and over to win the game.
The deck can also attack on turn 1 going second with Wally, and can use the unique Lysandre Prism Star to send opponent's cards to the Lost Zone, whether they're Archeops before Lugia can use Summoning Star, attackers in Regidrago VSTAR, or simply 1-of Supporters that won't be able to be recovered with VS Seeker.
Ceruledge is easy to pick up and that makes it particularly recommended for beginners, but it is also a strong deck in its own right that can definitely take down tournaments. It is fairly linear, though, so it can struggle against some strategies. For example, while one-Prize attacking decks are rare in Expanded, they would definitely have a strong matchup against most versions of Ceruledge because they would simply win the Prize race.