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.
No shop on TCG.shopping has this in stock right now.
Run a card shop?
Promise of LoyaltyExtended ArtCommander 2021 · 348 · rare$2.69
Promise of LoyaltyExtended ArtStar Trek Commander · 234 · rare$1.35
Promise of LoyaltyExtended ArtMarvel Super Heroes Commander · 319 · rare$0.98
Promise of LoyaltyThe List · 148 · rare$0.61
Promise of LoyaltyCommander 2021 · 21 · rare$0.42
Promise of LoyaltyMarch of the Machine Commander · 200 · rare$0.36
Promise of LoyaltyBloomburrow Commander · 148 · rare$0.35
Promise of LoyaltyCommander Masters · 833 · rare$0.34
Promise of LoyaltySecrets of Strixhaven Commander · 161 · rare$0.31
Promise of LoyaltyMarvel Super Heroes Commander · 142 · rare$0.30
Promise of LoyaltyMurders at Karlov Manor Commander · 79 · rare$0.30
Promise of LoyaltyFinal Fantasy Commander · 249 · rare$0.25
Command ChairExtended Art340 · rare$49.99
Hugh, First of ManyExtended Art321 · rare$49.99
ExplorationExtended Art301 · rare$41.99
Captain Kirk, Boldly GoingBorderless206 · mythic$39.98
Jean-Luc, Mon CapitaineBorderless190 · rare$30.00
Chain ReactionExtended Art280 · rare$24.72
SkullclampExtended Art354 · rare$24.68
Own the Day73 · rare$23.14
Cmdr. Troi, Outgoing EmpathExtended Art315 · rare$21.12
The Beacon of Kahless64 · rare$20.11
Locutus of BorgBorderless209 · mythic$20.00
Sea of CloudsExtended Art399 · rare$20.00