Does Teferi's ability that lets you cast spells at instant speed allow you to cast sorceries during opponents' turns?

Several versions of Teferi (such as Teferi, Time Raveler) have a static ability that reads: 'You may cast spells as though they had flash.' Under CR 101.1 and the specific card text, this grants flash to all spells you cast, not just instants.

Normally, sorceries can only be cast during your own main phase when the stack is empty and you have priority (CR 307.1). Flash overrides this restriction by allowing a spell to be cast any time you could cast an instant (CR 702.8a), which includes opponents' turns, in response to triggers, and so on.

Because Teferi's ability grants flash to every spell you cast, sorceries effectively gain that same permission. This is not granting a new card type — it simply changes the timing rules for when those spells may be cast (CR 702.8b).

Concrete example: It's your opponent's turn and they enter their combat phase. You control Teferi, Time Raveler. You can cast Day of Judgment (a sorcery) right now, before attackers are declared, because Teferi lets you cast it as though it had flash.

Note: This only applies to spells you cast. Your opponents are unaffected by Teferi's ability and must still follow normal timing rules for their own spells.