Each opponent can cast spells only any time they could cast a sorcery.
[+1]: Until your next turn, you may cast sorcery spells as though they had flash.
[-3]: Return up to one target artifact, creature, or enchantment to its owner's hand. Draw a card.
Like his predecessor, the Hero of Dominaria, Teferi, Time Raveler has become a format-defining card in Standard. His static ability renders counterspells useless and prevents end-of-turn shenanigans from Wilderness Reclamation decks, making him a must-deal-with card for many strategies.