Anytime you cast a spell that would trigger a prowess effect, Bria will make one of your creatures unblockable for the turn, letting you sneak in commander damage or even just regular damage through enemy lines
Each Collector Booster contains Rarers and/or Mythics, Traditional Foils, and a Full-Art Spiderweb Land
A lot of cards and even mechanics (scry, cough, cough) owe their existence to the influence that Brainstorm has had on the game
If your foe finds an answer, you can still keep up the pressure with your cards (and it lingers in the graveyard for reanimation fun times)
Then if it has ten or more point counters on it, remove them all and that player loses the game
Agathas Soul Cauldron is absolutely terrifying when used with Loot