PSA: Stop remaking your one mastery page every time you play a different champion...
Just to not save in time for the match to start... No one should ever have X for their keystone in ranked, EVER.
Just swap the specific masteries you need accordingly or do what I do and make 6 pages of 18+12 for swaggerific swapping efficiency.
Ferocity>Cunning Ferocity>Resolve Cunning>Ferocity Cunning>Resolve Resolve>Ferocity Resolve>Cunning
BOOM headshot!