If you can honestly say that you know how to stay focused and keep your play sharp throughout a whole tournament, then Storm is a deck that you can learn to pilot
For 2W, shes cheap to play, buffed by legendary permanents, and incidentally allows us to seek out legendary cards from the deck based on her strength
Chainer's has the perk of coming back for another round in the late game
The Lord of the Rings: Tales of Middle-earth Starter Kit was particularly good for a basic introduction although a single round playing with MTG veterans was enough to understand exactly how to play, down to the minute detail
It has some very specific requirements for its abilities, which limits (or at least heavily informs) the way you build the deck around it
Okay, now for the fun part: choosing your commander