Kasimir, Lions Servant

Trample,First Strike
Whenever Kasimir, Lions Servant attacks, an opponent returns a permanent he or she controls to their hand.
{1}{w}{u}{r}: Sacrifice a creature. Kasimir,Lions servant deals damage to an opponent equal to the number of cards in their hand.
" You are violating the laws of the empress and my goddess. Drop your weapons and surrender, or I will smite you in the mane of the greater good!!!