To build a solid case, let's go back to basics
Soul of Windgrace Soul of Windgraces abilities put a focus on discarding your own lands rather than destroying your opponents
Throw this on some of the new, nasty creatures that punish them for blocking like Phyrexian Vindicator or, its scarier and much more blockable friend, "Phyrexian Vindicator with a Colossus Hammer"
Due to this, Bulk Up hasnt been a major metagame powerhouse, at least until Firebending Student came along
In Modern, he might slide to the sideboard, but its certain he will see play in these formats because of how punishing he is towards certain strategies
If that happens, assume the controlled player did nothing during the turn except end the turn