Av'Roke, Mist Lord

Flying, Mistborn (This creature takes half damage from all combat damage, rounded down)
When this creature comes onto the battlefield, choose X creatures. You may create copies of each chosen creature, only those copies are 3/4 colorless Mist creature tokens with Mistborn.
Whenever this creature attacks and gets blocked, create a copy of all blocking creatures, only its a 3/4 colorless Mist creature token with Mistborn.