Is this LEGO Tahu Mask still considered rare?

Yes, this is a 2014 New York Comic-Con exclusive, making it a rare piece within the Bionicle theme.

What is the set number for this mask?

The set number for this collectible item is COMCON042-1.

This specific item consists of only 1 piece.

Name: LEGO Tahu Mask - New York Comic-Con 2014 Exclusive (COMCON042-1)
Brand: LEGO

Bionicle

Bionicle · 2014

Theme · BioniclePieces · 1Set Number · COMCON042-1Year · 2014

Used

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New / Sealed

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Is this LEGO Tahu Mask still considered rare?: Yes, this is a 2014 New York Comic-Con exclusive, making it a rare piece within the Bionicle theme.
What is the set number for this mask?: The set number for this collectible item is COMCON042-1.
How many pieces are in this Bionicle set?: This specific item consists of only 1 piece.