The eight-costed demon shouldn't be too much of an issue with all the mana we're going to be able to produce, and with lots of thopter tokens floating around from cards like Efficient ConstructionEfficient Construction and Thopter Spy NetworkThopter Spy Network we will be assembling kills so fast Donald Trump won't even believe my claim about how fast we'll be assembling kills
And if we cant kill our opponent that turn, we can surveil our way into another Hurkyls Recall
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You then decide to play Panglacial Wurm - you can play it now mid-searching, but you cannot use the land you want to find with Mesa, since whatever the search effect was, has to resolve after you're done with Wurm shenanigans
Although early Magic decks show that the full import of card advantage wasnt yet grokked by the community at large, people did understand the value of a two-for-one, or perhaps a five-for-one
On top of that, the other three modes are all hugely relevant, too