Legendary creatures have a whole set of rules that apply to them, but for the purposes of this article, all you need to know is that a legendary creature has the Legendary Creature text on it, like [c]Kenrith, the Returned King[/c] below
Exiling any nonland permanent is a brilliant start, offering universal removal to get yourself out of the tight spot youre likely in after committing turns to the ramp and color fixing necessary to cast the card
However, this deck does require good resource management to maintain pressure and not run out of steam too early
Are ya ready, kids
Supporting local card stores means supporting the local TCG community, and it can help fund TCG tournaments, events, and even pre-release days for upcoming sets
Vigilance is fantastic in Commander where it allows you to attack and still ward off attacks from 3 other players, and it's even better on flyers like Birds