They read, Whenever an opponent sacrifices a nontoken permanent or discards a permanent card, you may put that card from a graveyard onto the battlefield under your control. That means you can attack in multiple ways, and as long as youre interfering with your opponents hand and board state, youll benefit massively from it
BPhillipYork: Neat, and gives you a way to sacrifice your big Titans in response to being exiled so they go back into your deck
That said, in Duskmourn where different types of cards matter, its helpful to send a specific kind of card to the graveyard, like creatures
FromTheShire: 3 is pretty standard to pay for an anthem, and this comes with the upside of being able to exile a problematic permanent later
Its even a commander option for EDH players