Promise of Loyalty is a rare Sorcery card from Magic: The Gathering (Commander Masters, CMM). Current market price: $0.38.
Rare
Commander Masters (CMM)
{4}{W}
Mana Value
5
Colors
W
Card Text
Each player puts a vow counter on a creature they control and sacrifices the rest. Each of those creatures can't attack you or planeswalkers you control for as long as it has a vow counter on it.
