This clever loop relies on Horde of Notions and its five-color activation cost, which is precisely fueled by tapping Jegantha, the Wellspring for the exact colored mana needed to replay it from the graveyard. Phantom Train acts as the necessary sacrifice outlet to bin Jegantha while conveniently growing larger with +1/+1 counters each iteration. Meanwhile, Temur Ascendancy oversees the entire engine by turning those repeated entries into a bottomless well of card draw.