Simplify the Aura class
Simplify the Aura class

It is no longer a BaseCard subclass, much more efficient that way.

amw2104/fireplace,oftc-ftw/fireplace,Ragowit/fireplace,amw2104/fireplace,Meerkov/fireplace,Ragowit/fireplace,liujimj/fireplace,liujimj/fireplace,smallnamespace/fireplace,butozerca/fireplace,jleclanche/fireplace,smallnamespace/fireplace,beheh/fireplace,oftc-ftw/fireplace,butozerca/fireplace,NightKev/fireplace,Meerkov/fireplace