mtg from the vault transform card list Vault: Are the From the Vault

Some projects closely follow traditional MTG formatting for familiarity during gameplay, while others completely redesign the visual structure to create original fantasy card games inspired by Magics gameplay systems

Because we didn't always have access to multicolor (this was back in the day where we wouldn't put multicolor cards in sets without a multicolor theme), we decided the ability made the most sense in black

And you can activate at instant speed

Station is an activated ability that can be activated only as a sorcery, meaning during your main phase when the stack is empty

While this is a solid benefit, Sigarda also has a coven ability that allows you to look at the top five cards of your library, reveal a Human, and put it into your hand as long as you control at least three creatures with different powers