All three starter decks have active communities
He can also reliably pitch your hand into your graveyard, which can make a good setup for graveyard strategies - whether you're trying to get an Underworld Breach / Lion's Eye Diamond loop going for a combo, or just want to reanimate something huge
Two or 3 mana to remove each of your opponents scariest creature is an excellent deal
And, make no mistake, filling the 'yard accounts for half if not more of the power of this card, especially when you can build around milling yourself with your pick of Delve, reanimation effects, Delirium, Undergrowth, Karador, Ghost ChieftainKarador, Ghost Chieftain, Muldrotha, the GravetideMuldrotha, the Gravetide shenanigans
Pernicious Deed That is one deadly balloon payment