However, unlike things like Fable of the Mirror-Breaker, my dishonourable mention for the year, Boseiju is an answer, rather than a threat
If the spell you cast that caused Kellan, the Kid's last ability to trigger is represented by a split card, the characteristics of the half you didn't cast are ignored while that spell is on the stack
My guess for a potential rare land cycle is the Worldwake creature lands, since Celestial Colonnade and Creeping Tar Pit need a reprint and the rest of the cycle is cheap enough to prevent their inclusion from taking up too much EV
The copy is created on the stack, so it's not "cast." Creating the copy won't cause abilities that trigger when a player casts a spell to trigger
As described above in the card-by-card explanations, these are commanders that tend to be exclusively frustrating and power outliers at lower brackets