2 added 137 characters in body
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Yes. The Mask doesn't have hexproof, shroud or similar.

Even when attached, the equipment and the equipped creature are two separate permanents. Only the creature gets +1/+2 and hexproof. Nothing in the scenario you described gives the Mask any abilities (such as hexproof) when attached.

Yes. The Mask doesn't have hexproof, shroud or similar.

Yes. The Mask doesn't have hexproof, shroud or similar.

Even when attached, the equipment and the equipped creature are two separate permanents. Only the creature gets +1/+2 and hexproof. Nothing in the scenario you described gives the Mask any abilities (such as hexproof) when attached.

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Yes. The Mask doesn't have hexproof, shroud or similar.