90% of the time I'm playing Explorer since I like my decks always being available, and I'm not a big Alchemy fan, but I do dabble in Historic/Standard/Historic Brawl on occasion.
Red aggro decks would be a good starting place, they're good enough to keep you playing and cheap enough that you arent burning tons of wildcards on most decks. Then as you build up your wildcards and test out other modes you'll have a better starting place.
So can someone confirm if 'they' ever got Chromecast access functional in Firefox yet? Last time I looked into it and tested it out the plugin or fx_bridge or whatever it was called was years ago and it never managed to work, which is the sole reason why I haven't switched to Firefox.