Ill admit I was sucked in a little, too, and it took me a moment to realize that a better option already exists
Nothing feels better than casting a second cantrip and flicking another creature that scries or draws you cards
If a card doesn't specifically use the word win, there's no winning outcome, so a cards like Two-Headed Giant won't ever trigger a payoff like Zndrsplt, Eye of Wisdom
Most planeswalkers take turns to reach their full potential, but the flying + counters mode on Elspeth can kill your opponent the turn you cast it without lessening its ability to be a long-term advantage engine
However, that is a pretty big assumption, and there is the ulterior motive of wanting to transition into a post-fetchland world
Not dying for longer means more turns, which means more opportunities to draw cards and take over the game