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
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
If heads, they may search their deck for a basic Pokmon, put it on their bench, then search their deck for a Pokmon Tool card and put it on that Pokmon
Astarion, the Decadent Astarion, the Decadent turns your opponents pain into more pain
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