It sounds like The Sword of Gideon enhancement. Once the abiltiy completes by discarding an evil enh in play, then if the evil character has initiative to play an enh, then the evil character can play an enh such as Evil Strength "Negate and discard the last good enh played this battle." This would undo Sword of Gideon's discard of the evil enh, the evil enh will be put back where it was before it was discarded, and Sword of Gideon will now be discarded.