Here's the feedback from TicBits about this latest game update;
"Tiny update, video ads are now the main source of ads (But if there's no ads to show, it'll fall back on those playable ads). Also, the Thunderstorm works differently, shorter cool down but has a limited casting times (and is longer on the field +2sec per level)."
May I request those who possess Thunderstorm spell card to update its page with current information.