I happened upon this card by chance, when shopping for singles to help bolster my other commander decks, and picked it up thinking it would be prefect for a Simic deck I had been planning to build for a while with Tatyova, Steward of the Tides as the commander, reasoning that the lands recurring would be very effective
If your choice somehow ends up with an instant or sorcery card as the back face of Werewhat, Werewhat would be unable to transform away from its daybound side, so it would remain daybound even if it's night
There were several cards vying for it, including Tyvars Stand, Encroaching Mycosynth, and Sword of Forge and Frontier
That makes it removal target #1 for everyone, and players run more artifact removal these days, so it doesnt actually stick around that often