In some cases, this was down to power level, but usually it was just because the option to include a Companion created a why not? mentality among players
If the cards have sleeves to protect them, they double in thickness, thus requiring more space
As a super super rough guide I would want upto 50% ramp effects, 25% mid level threats and value and up to 25% heavy threats contingent on the amount of ramp you have
6 Erikas Bulbasaur: Gym Challenge First Edition (Uncommon) $14.73 A Great Grass Duo Erika's Bulbasaur gets major points for being one of the cutest depictions of Bulbasaur while also featuring a Leech Seed action shot with a stunning background
Games will quickly spiral out of control while you remove your opponents creatures and bury them in card advantage
Secondly, we have a few Tyranids that give us a nice supply