Defile is the most fun card printed ever. It's the thinking man's boardclear!
So satisfying when you math it out just right and wipe out everything
Was against a paladin with a Spikeridged minion and Tirion up, plus a couple others. Spent my full turn planning, then hit his Spikeridge with THIS minion and popped Tirion bubble with THAT minion and Drain Soul'd my own Infernal to get the numbers exactly right, so that a single Defile without a Zealot available wiped the entire board, including the 2/6 that popped from Spikeridge.
Not bad for 4 mana =)