Don't forget to exchange your heroes if you haven't done so already... Nothing like an extra devo'd champion sitting around like a mean red pimple on a porcelain french girl's forehead. Not to mention the champion won't go away without a loss of resources.
Good thing you reminded, just why so late
I almost forgot, and reminded myself when i wanted to go to bed yesterday. Since it was late i only exchanged 3x Druid and 2x Champ. I don't think i will reach that high in BT to use new stones so it is not big waste, but Zenith will be needed for sure.
Once again it payed off to have lot's of savings, especially that it looks like with each new balloon event we will receive those exchanges.