When activating Carionette (Tempest) it remains in the graveyard

[Simon84s]

Describe the bug
The card Carionette from the Tempest set, reads "2BB: exile Carionette and target creature unless that creature's controller pays 2. Activate only if Carionette is in your graveyard".

When I activate Carionette in the graveyard it and AI opponents does not pay the 2 mana cost, it exiles the opponent card but remains in my graveyard and can be used again.

To Reproduce
Steps to reproduce the behavior:

1. Start Quest mode (haven't tried in other modes)
2. Have Carionette in the graveyard
3. Click on Carionette, to activate ability.
4. Make sure opponents does not pay the 2 mana cost
5. Carionette remains in the graveyard

Expected behavior
Carionette should be exiled.

Desktop (please complete the following information):

• OS: Windows
• Version Forge 1.6.65 Quest mode