Asides from the special match mode "earthquake", There are other ways to use Brighton Bloom summoner and whenever I do use her outside of that special game match, I consider it a game of chance. This strategy relies heavily on luck and optimizing your edge with a some debuffs and heavy damage. This deck strategy would only be useful against melee and range decks. It won't work against a mage deck as those attacks never miss with speed and flying abilities.
For the first part, I would highly suggest using the Ooze to maximize the efficiency of evasion of your cards, thus the enemy cards would be more unlikely to hit your cards.
I personally prefer the Serpent of Eld for the first position because of it's high speed and ability to increase it's evasion rate, making this tank hard to hit. Otherwise, you could choose a tank with a high speed and a decent damage.
For the back line, I would suggest using cards with high damage output to clear out the game as fast as possible. Again, since you are relying heavily on luck. It's a matter of time till that luck runs out, so try to end it in your favor as soon as you can. I use this strategy whenever I feel like gambling the odds in winning against the earlier mentioned decks. Feel free to let me know your thoughts! Upvotes and comments are welcome! Enjoy!