With the inclusion of so many new planeswalkers, it's no secret that War of the Spark meta will be populated with planeswalker-heavy lists. This knowledge will prompt many players to include The Elderspell into their sideboards.
It is clearly a very powerful removal spell that can be also used to a great effect in a main deck. In that case you also need to run Nicol Bolas, Dragon-God, then wait for the right moment, and finally use its minus eight ability to win the game.
But as already mentioned, this will be mainly used in sideboards as one of the best tools against superfriend decks.