you can put wave files in this folder. the name of the file can be any ability (flying.wav, trample.wav, lifelink.wav, ...) or a supertype (artifact.wav, sorcery.wav, creature.wav...) or a type (human.wav, dragon.wav...) The game will automatically use the files ( if they are available) when a card comes into play. Special files are mana.wav and graveyard.wav