It's not really draining, well I never play for extended periods with phone anyway. Just use search points and for this event, burn raid points away for event currency.
Oh, and glad for your waifu bloom power up. Too bad her art is still in another castle.
PS: I know I ask this before but anyone can confirm this again? Is there expire date for choose your rainbow ticket? If not, I will wait for Easter Cactus reissued and try my luck again (Should be 2-3 more events till her event comes back), if failed, I will trade ticket for her.