While some might assume that Breena is a Group Hug commander due to providing card draw to the entire table, she is far from it: yes, your opponents can draw cards off her too, but in exchange you get +1/+1 counters and they had to attack your opponents in the process -- so you will be the one benefitting the most at all times
At the end of the game, they vanish back to wherever it is they came from
You'll often find a way to make blue mana by the time you're ready to cast Possessed Skaab
All in all this is the business in matches where everyone has countermagic
Impulse draw is Magic slang for exile your top card and you may play it this turn. It fits red because the color is so impulsive, it must have its resources ASAP, and having cheap cards in your deck raises the chances of casting them
The two best cards from Homelands are spells anyhow (Merchant Scroll and Memory Lapse), further adding insult to injury