Brain in a jar doesn't work the way you think it is. "Put a charge counter on Brain in a Jar, then you may cast an instant or sorcery card with converted mana cost equal to the number of charge counters on Brain in a Jar from your hand without paying its mana cost." and since RB cmc is 0 there isn't a way to cast it since it has to be equal and the jar can only start with a minimum of 1 counter and the same goes for Boseiju, Who Shelters All since RB doesn't have a casting cost we cannot cast it with Boseiju.
That said, try using the tried and true As Foretold combo since not only can we cast RB at 0 but it's a clock that lets up free up future mana. Also, is there a reason you aren't using posts?
Brain in a jar with a sac outlet lets you 1 shot the combo.
You put the brain trigger on stack then sac the brain. Then it remembers x=0 and lets you shortcut a 0 mana spell (take your pick).
As Foretold + Brain In a Jar together SHOULD be able to open up a borderpost-less list. Thats what Ive been exploring. You can use signets / talismans which are very elegant and let you branch into whatever colors you need instantly. Wish they would finish out the talismans with the other 5 enemy ones tho :D. You also get Mox Opal in any signet/talisman heavy lists.
Basically the goal is always the same:
+ Greater Gargadon suspended.
+ Way to shortcut 0 mana things. Either once: Brain in a jar. Or multiple times: As foretold. Or find one from your deck to slam with : Bring to Light. The Boseiju is for the bring to light plan mostly.
Depending on your list this SHOULD be enough. You either need to have lands stay so you can do things after, or break other elements like Monastery Siege is a great card. Maybe even bitterblossom IDK. Theres a lot of good artifact / enchantment / planeswalkers to break symmetry after a restore balance.
Hello people, I've been ghosting the thread for a couple days and have been wondering what list has the best ratio for wins? Also any tips on playing the deck for the first time? Thank you ahead of time.
You're right on the brain in a jar + sac outlet interaction. It technically works.
Also you can use Perilous Research as well with brain.