giovanni's exile pokemon card - 174/214 - Uncommon Trainer Form Error? Giovanni's Exile texturing :

This means that 23.4% of the time (so just under one fourth of the time) you will open at least one extra rare or mythic rare in the Set Booster, and that's just from the wildcard slots

While the designers did fit enough Convoke cards to fill out a precon, and the new Convoke cards they designed for the product are all very good (Flockchaser Phantom is cracked), they were seriously reaching to fill those remaining slots and put in some real bad stinkers in there too (Chant of Vitu-Ghazi)

At the very least, ditch the inkjet printer & pick up a black & white laser printer to save oodles on ink

13 Free day on a peaceful island