Priority not held in response to planeswalker ability
Teferi (-3)'s to return commander to hand / command zone. Priority did not pass for me to cast Heroic Intervention.
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Lame_Tempest#34888
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[Deleted User] commented
Which Teferi? The Time Reveler? If so, the answer is in that card's first line of text: "Each opponent can cast spells only any time they could cast a sorcery."