Any one-shot Item, since they are Items. The rules say:
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Any Item card may be played to the table as soon as you get it, or at any time on your own turn other than in combat (unless the card itself says otherwise).
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And;
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One-shot items, such as potions, may be played directly from your hand during combat. You can also use one-shot items that you already had in play.
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And, finally:
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Any one-shot Item can by played during any combat, whether you have it in your hand or on the table.
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