Fix counter placement sound playing repeatedly.

git-svn-id: http://svn.slightlymagic.net/forge/trunk@27743 269b9781-a132-4a9b-9d4e-f004f1b56b58
- Re-factored payManaCostFromPool() out from payManaCost()

git-svn-id: http://svn.slightlymagic.net/forge/trunk@27744 269b9781-a132-4a9b-9d4e-f004f1b56b58