It draws cards at a rate that Rowan, Scion of War is happy with, and you can pay a lot of life when you have the mana to untap it
For Worldpurge, that means blinking a bunch of cards out of play, resolving this 8-mana sorcery, then being the only one left with a board when your cards re-enter
Theyre entirely tied to the flavor of D&D, so they wouldnt really fit anywhere else
Josu Vess is fine value as a 4/5 with menace, but really blows up if you can hit its kicker cost
It also plays great with equipment that grants attack triggers, such as Argentum Armor and Armory of Iroas, adding another string to your dual-trigger bow
Vile Rebirth is a great sideboard card for a problem that does not exist