u/Djanni6

Probably a very simple question, but if I cast [[Necromancy]] through [[Beseech the Mirror]] having paid the bargain ability and in my main phase since BtM is a sorcery, is the card cast "any time a sorcery couldn't have been cast" or it's actually just a main phase cast?

My doubt comes from knowing that [[knowledge pool]] + [[Teferi, Mage of Zhalfir]] interact in a way that doesn't let your opponents cast spells, iirc.

Are the two cases similiar and I will have to sacrifice my creature at cleanup, or I will be able to keep it on the battlefield? Also looking for confirmation on the second interaction since I'm not 100% sure it works that way.

Thanks in advance!