Although there have been reports of 60/40 on the front and 75/25 on the back getting PSA 10s but I suspect these are cheap cards that PSA doesn't mind handing out 10s for or card has GM10 standard met for all other aspects of the card
If you are using Doubling Season in one of the many decks built around +1/+1 counters then this is better as it does everything the Season will do in that build only for a cheaper cost
Each Collector Booster contains a foil ukiyo-e land
Recurring Nightmare Market Price: $70.09 One of the two cards that undergirded the overwhelmingly dominant Recurring Survival archetype in Standard at the time of its release, Recurring Nightmare allows you to repeatedly recur a creature from your graveyard by sacrificing another creature and returning Nightmare to your hand
But that simple "may" clause rules all
On the front, Cosima is a little hard to parse, but essentially, she works like so: at the beginning of your upkeep, you exile Cosima