Why Fossil Dyna? It has brought me good luck in all my regionals. It has helped me turn the tide.
I can flip it to destroy a post-swarm Saber/Blackwing play, help control the field with Necrovalley in play, prevent Gorz/Fader plays, keeps Heralds at bay, and then some.
Still don't know whether to make this change or not, but I will be testing during the week.
Hoping to get some regional coverage videos as well...