Here's the rest of our original critique of the deck: While the Merlin/Madam Mim Bounce package is strong and will surely see play in the new meta, there aren't enough of them in this deck to create a reliable strategy
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Hold it in hand, let Zaffai cast it without paying the mana cost, then pay the overload cost from your actual mana pool to cast every spell in your graveyard
But the real power shows at the beginning of combatif you have a full party, all your creatures get +1/+0 and indestructible until end of turn
Exiling certainly works in taking care of Avacyn, same with dealing out -1/-1 counters
This means we cannot attribute the difference in price between Abzan Aggro and Abzan Red to one build playing more fetches