To determine the total cost of a spell, start with the mana cost or alternative cost you're paying (such as a flashback cost), add any cost increases (such as kicker costs), then apply any cost reductions (such as that of Urianger Augurelt's last ability)
Being in Boros colors (red/white) gives her access to plenty of double strike enablers like Reyav, Master Smith or Boros Charm, which can turn her stagger ability into a game-ending combo
Ursula's Return Starter Deck Sapphire & Steel Heroes are the star of this starter deck, with cards like 004-190-philoctetes-no-nonsense-instructor and 004-137-anna-braving-the-storm rewarding you for playing them
I certainly have been having tons of success with blue, but the format is quite well balanced, so every color has multiple good decks you can get into
Starscourge At the beginning of combat on your turn, exile up to one target creature card from a graveyard