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
I did not understand the concept of save points
While there are dozens of printings of Lightning Greaves, only one of them features an extremely adorable puppy who has evidently been chewing on this pair of greaves by the front door
Those 3 life points usually didn't matter much, but occasionally they make all the difference, especially when a deck finds itself in a position to do 14 or 17 damage all at once but can't do 20
This sounds extreme, but you might want to protect your investment a little more than just double sleeving if you're playing with some really expensive cards like dual lands or Demonic Tutor
Having this kind of effect on a land is solid, not to mention uncounterable (watch out for that land destruction, though)