Labyrinth-Raptor

If a creature is attacking a planeswalker, the planeswalker’s controller is the defending player.

Labyrinth Raptor’s second and third abilities apply to itself as long as it still has menace.

The defending player sacrifices a blocking creature before combat damage is dealt. This may cause a single creature to be blocking the creature with menace; the blocking creature remains blocking. It will still deal and be dealt combat damage as normal.