A 5 would be 85/15 or better on the front and 90/10 or better on the back
Plenty of options here, so many that you might not even need rares to get the job done
To make things easier, start by sorting your collection by rarity to find the expensive uncommon, rare, and mythic rare cards
As hyperbolic as that may sound, I realized it was high time for my beloved Phyrexians to make their return and demonstrate what true perfection is
I currently own 29 fully signed Commander decks, a fully signed 450-card Peasant Cube with 35 signed basic lands per color, my binder of signed planeswalkers, my oversized signed card collection (Planechase/Archenemy/Etc.), a longbox of signed tokens, and four-and-a-half of the Magic Holiday Gift Boxes full of signed cards