Casualties of War
Because of the way Kroxa and Kunoros' ability resolves, you can sacrifice it in response to the reanimation clause, sacrificing it to the Altar, to mill six cards and then exile five of them to return Kroxa and Kunoros to play, triggering its ability again in an infinite loop
Mimicking several of his other appearances, Gilgamesh's appearance is a coincidence, as he stumbles into World B, where the wars are taking place, while traveling through the Void and the worlds connected to it
Do MDFCs count as lands or spells for ramp math
It works as either a budget choice over Cabal Coffers, or a second copy of sorts for redundancy
Some decks just can't beat this and so you win, all be it very slowly