Collectible Card Game Headquarters

Describe the Bug:
Roilmage's Trick makes owner's creatures get -X/-0.
Imagine that I couldn't get why AI didn't cast it when I attacked with unblocked creatures even if AI would die.Now AI's behaviour seems a lot better.

Which card did behave improperly ?
Roilmage's Trick

Which update are you using?(date,name)Which type(Duel,Gauntlet,Sealed Deck)
Manalink 2016/01/15: Battle For Zendikar v2,duel

What exactly should be the correct behavior/interaction ?
Roilmage's Trick makes opponent's creatures get -X/-0.

Are any other cards possibly affected by this bug ?
-

Fixed in 1c23544.

Interface question, but when I had mana of each color and colorless in my pool and I cast Roilmage's Trick via single click it never asked how I wanted to cast it, but just used the colorless mana. But if you added mana manually it worked fine.