Labyrinth Raptor

Menace
Whenever a creature you control with menace becomes blocked, defending player sacrifices a creature of their choice that's blocking it.
{B}{R}: Creatures you control with menace get +1/+0 until end of turn.

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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.