At the end of the exchange, you will have a Tarmogoyf and a mystery card
So if yer feelin' a bit lost, stranger, here's the lay of the land
Heres how it plays out: You are required to have The Gitrog Monster out, Dakmor Salvage in hand and more than 7 cards in hand total At the end of the turn, discard down to hand size, discarding Dakmor Salvage This gives you a draw card trigger from The Gitrog Monster Priority passes to opponents On resolution of the draw trigger, replace this with the dredge from Dakmor Salvage, milling 2 cards and returning Dakmor Salvage to hand As it is still the cleanup step you still need to discard down to 7 cards in hand, again discarding Dakmor Salvage and repeating the combo above on a loop The idea is you loop this to fill your graveyard and try to win from there
There shouldnt be any surprises in the stock categories of ramp, card draw, removal, and recursion, though I wanted to call out Ruthless TechnomancerRuthless Technomancer specifically