At the beginning of combat on your turn, you may remove three quest counters from among permanents you control
Due to the prevalence and power of bounce effects (Sea Titan, Erase, etc), permanent gain control effects are inherently risky (since your opponent can bounce the champion you stole back to their [the owners] hand), but the fact that this also leaves a body in play that they have to answer might make this worthwhile
Otepec Huntmaster, for instance, offers the same effect, albeit for two mana
Each time a creature explores, you get a different benefit based on what you find on top of your library
Cards that shut off their abilities will no longer act as removal, but will instead just hold Sagas in a kind of stasis
"Planar Portal" has more opportunity for power creep to factor into its gameplay, but "Merciless Rage" is more focused on one specific mechanic whereas "Planar Portal" has roughly three to consider