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.
And so was born the Fantastic Four! And from that moment on, the world would never again be the same!
![Promise of Loyalty [Marvel Super Heroes Commander]](http://www.cardmerchanttakapuna.co.nz/cdn/shop/files/4f93b969-07f1-5126-8876-c429b15fb815.png?v=1782913179&width=1445)