Repeatable removal is powerful even if it's just bouncing a creature to hand, and you may have creatures you want to bounce so you can recast them
That said, there are some silly cards in the Precon that can add to the combo
Inspiring Leader and Popular Entertainer are both great here, but Guild Artisan can also work depending on the angle you go with in deckbuilding
Teferi, Master of Time I typically avoid planeswalker ults on lists like this because achieving them is incredibly inconsistent, but Teferi, Master of Times static ability makes it much more reliable than most and all the card filtering helps sculpt the perfect hand for those two extra turns
Ive enjoyed Coastline Marauders in Isshin quite a bit, and Ive also enjoyed hasty beats in Chainer too
It doesn't look amazing, but it can be pretty powerful