Its been overwhelming, confusing, exciting, and I only regret it a little bit
Everything else is more utlity
While the ability to gift a card and potentially cast it later adds an interesting twist, the high cost of B B may limit its efficiency compared to other removal spells like Thoughtseize or Inquisition of Kozilek in competitive Magic: the Gathering formats
For decks like Derevi, Empyrial Tactician or Nadu, Winged Wisdom, having a mana dork on turn 1 is often better than waiting until turn 2 for a ramp spell
They cost just 75 cents though, pretty cheap from where I am sitting
After sending out cheap cards to get you onto the board (like Sergeant Tibbs, Courageous Cat or Aladdin, Prince Ali), try to buff them whenever possible with items and characters such as Megara, Pulling the Strings