Tai Vanno, Harvester of Souls

Trample
When Tai Vanno, Harvester of Souls deals combat damage to a player, exile all cards from that player's graveyard.
My mother, Karametra, calls herself God of the Harvest, and yet she cares only about grains and wheat. I harvest the souls of the dead, so that they may never become Returned. Who then, would you say, is the true God of the Harvest?