Reads:
Activate 1 Blue: Destroy 1 card in your hand and draw 1 card.
When you activate it, you can only destroy one of the first 4 cards in your hand. There is no way to select the 5th or 6th card, which seems counterproductive as most people would likely move the cards they don’t need at the moment to the bottom of the queue.
Yes, in order to play around it…move one of your cards you want to discard to number 4.
This bug occurs with anything that has a choice of discard, including Magmatic tutor as well.
Yea, I normally do that when I know I’m gonna match it but I’ve been known to get caught with my pants down when an unexpected cascade activates it 
I was just about to post this and apparently it’s a really old bug. Come on devs! It’s still happening many months and several patches later!
B U M P