The E-HL (Worlds 2004) format has recently been my favorite format. It is quite a skilled-based format, with Delcatty + Oracle grabbing what you need to set-up. There are also a lot of archetypes in the format, allowing for many different playstyles. The format is supported on TCGOne, but it usually takes me a bit of time in order to find a battle, with most opponents using non-competitive decks. I’m trying to create a play-testing group for the format, as the format is quite fun.