What denotes this card as being offensive is the correlation of this effect with the word cleanse as this is a bit too close to the concept of ethnic cleansing. This term refers to the extermination of minorities
Getting him on the board might take awhile since he costs five mana, but the possibilities are staggering
Steel Hellkite is a more limited, and expensive, way to interact with out opponents, but it wont create as many feel-bad moments for the other players as Ugin, the Spirit Dragon does so we might be able to make some allies afterwards
Black Cauldron had been announced before, but the big surprise is Gargoyles
Im putting Pippin in just about all of my Commander decks that can run him and am tempted (heh) to build a deck with him as my commander
If Blood Artist effects as payoff this will double the effectiveness of your dorks when used as fuel