The Chosen Undead

The Chosen Undead must be blocked if able.
As long as it's your turn, The Chosen Undead has
indestructible.
Whenever The Chosen Undead deals damage to a
creature, if that creature was dealt excess damage
this turn, that creature's controller sacrifices a noncreature, nonland permanent.

"Thou who art Undead, art chosen"

[Maarika, Brutal Gladiator]