If your commander has a converted mana cost of three, casting it a second time will cost a total of five mana, and then seven, and so on
Its an interesting design that can be foiled with graveyard hate or expensive spells, and it shows that Counterspell is always a safe choice
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In addition to the clan's archetypes, they were interested in creating decks that focused on Dragons to allow for some variety in play, especially for more experienced players who would draft the set a lot
It is a tool for aiding understanding and by over complicating it you probably lose some convenience and utility
In that clip, Rachel Weeks draws specific attention to the card's low price tag (at time of filming), but also states that "it might go up out of nowhere"