11 cards where the name is exactly “vow of duty”

Vow of Duty (Murders at Karlov Manor Commander #89)
Vow of Duty (Starter Commander Decks #40)
Vow of Duty (Game Night: Free-for-All #21)
Vow of Duty (Commander 2021 #110)
Vow of Duty (Commander Legends #54)
Vow of Duty (Explorers of Ixalan #6)
Vow of Duty (Commander Anthology #29)
Vow of Duty (Legendary Cube Prize Pack #15)
Vow of Duty (Commander 2015 #84)
Vow of Duty (Conspiracy #87)
Vow of Duty (Commander 2011 #36)

The message was clear to Sorin—time to search for something else.