A full guide on how to measure and tune the power of your Commander deck merits its own article, and I plan to write that soon
It will also have a collectors list of every card, with a box to check if you have the standard, foiled, or another version (for Enchanted or promo versions)
On your first extra turn, do it again: cast Nexus of Fate for an extra turn, then tutor it back out of your library with Mystical Tutor
Its application here is more limited, since you ideally don't want to be bouncing your big stuff to your hand
Otherwise, Im staying away
Snapcaster Mage Snapcaster Mage was infamously largely playtested without flash, due to some miscommunication, which still would have been an extremely strong card