Take the rules text Whenever a player casts a spell they dont own, for instance
Extort lets your disruptive piece pressure your opponents for some clean utility
Fortunately, protecting your collection doesnt have to be expensive or complicated
After going through this list I'm seriously considering changing my prerelease guild choice to Gruul
(At the beginning of your upkeep, put an age counter on this permanent, then sacrifice it unless you pay its upkeep cost for each age counter on it.) When this land enters, sacrifice a land
Edgar Markov Edgar Markov is the go-to vampire Commander, with the certainly-broken Eminence ability (shared by another one of MTGs best commanders who just missed out on the list, The Ur-Dragon), allowing it to generate endless vampire tokens without ever even being cast and in a way that cant be interacted with