Nightmare King Grimm

Flying, First strike, Hexproof
Enimatic Entrance—When this creature enters each player starting with you secretly chooses Bow or Fight. Each player who chose Bow draws a card for each player who chose Bow, then each player who chose Fight deals 5 damage to each player that chose Bow.

When Nightmare King Grimm attacks, create three 2/1 black and white Nightmare Insect creature token with flying, tapped and attacking the same player. sacrifice them at the end of combat.
Attacking Nightmare