Collectible Card Game Headquarters

Describe the Bug:
Deepfire Elemental doesn't destroy the targeted artifact or creature.When targeting a creature although you pay the correct mana when the ability resolves it seems to destroy the creature with the least power or cmc or random.When you target a non-creature artifact it seems to destroy a random creature.

Which card did behave improperly?
Deepfire Elemental

Which update are you using? (date, name)Which type? (duel, gauntlet, sealed deck)
Manalink 2016/08/27: Eldritch Moon v2, duel

What exactly should be the correct behavior/interaction?
Deepfire Elemental, Destroy target artifact or creature with converted mana cost X.
Are any other cards possibly affected by this bug?
-

The bug is similar to bellow bug:
viewtopic.php?f=110&t=15978&p=168064&hilit=Plaguebearer#p167348

If you autotap mana by double clicking on the target then that target gets destroyed. If you pay manually the mana then it will destroy the creature or artifact that has the same cmc as the card targeted with the lowest in game card id.

EDIT: Fixed in commit abad27fe.
Edit2: Fixed Gorilla Shaman that had the same bug in commit 4adf98d2.