Summary Kaldheim set introduced many meta-defining cards playable in Pioneer and Commander formats
Patrolling Peacemaker cleverly turns your opponents removal spells against each other by giving you proliferate triggers
The Proliferate upside is nice, as bouncing something expensive is usually the best thing to do to get the most tempo, but if you have enough counters around, or you feel the need to fire it off early, you get some upside This is trying to do an impression of Icy Manipulator and its doing a pretty solid job
At the time, these foil cards were exceptionally rare, much rarer than drop rates that players would find today
In a format like Commander, where key spells can make or break games, the ability to retrieve and reuse them is powerful, especially in a land slot