For the purpose of making my question easier we will use the card "Professor Kukui" as the example.
The only booster set Kukui is currently printed in is base Sun & Moon.
However a recent theme deck Twilight Rogue contains Kukui for example.
Let's say the format rotates to become Forbidden Light on-wards, would Kukui be legal for Standard play?
The only booster set Kukui is currently printed in is base Sun & Moon.
However a recent theme deck Twilight Rogue contains Kukui for example.
Let's say the format rotates to become Forbidden Light on-wards, would Kukui be legal for Standard play?