Cast spells to copy spells (with Primal Wellspring) and copy those copied spells again (with Double Vision) to copy more spells that copy spells (with Mythos of Illuna).
Here's the math:
Assuming you are casting all Mythos of Illunas with from 4 Primal Wellsprings to copy a Double Vision with 4 Double Visions on the battlefield, you will have created 9 copies of Double Vision (total of 13 Double Vision) with your first Mythos of Illuna, 18 copies with your second (total of 31), 36 copies with your third (total of 67), and 72 copies with your fourth (total of 139).
BUT WAIT! THERE'S MORE!
If copying spells couldn't be more fun, there's The Mirari Conjecture! Let's just make 144 of them when you use that from 4 Primal Wellsprings to cast Mythos of Illuna targeting The Mirari Conjecture, and copy a spell 283 times!
BUT WAIT! THERE'S STILL MORE!
If you can do it again on that 283 copy cast turn, and this will result in copying a spell 420+ times!
YEEET!
I would call this deck... a Xerox machine on steroids. A little slow in the start, but that's what the creatures are for.
It just doesn't sound fun for anyone except for you. You'll look at them while rubbing your nipples, and proclaim, "OOPS!" Your opponents, on the other hand, will be demoralized from having to wait for you to pull out your calculator to verify the number of copied spells/life you now have/how many permanents you get to bounce/creatures exiled/damage you dealt. Stop.... get some help, but also.... this is why we play this game.
Yeah, it's 65 cards and is lacking some draw, but the idea is to only cast one spell each player's turn if possible/necessary.
The Narsets in the sideboard are there because.... reasons? Idk, I just want to have fun, and they do do stuff against certain matchups (mostly control).
