Serosh, Godfrey's Shadow

When Serosh, Godfrey's Shadow enters the battlefield, enchant target creature.

Enchanted creature has, "If this creature were to die, you may sacrifice Serosh, Godfrey's Shadow instead. If you do, it gets +2/+2 and gains trample. Then, if you are the monarch, target creature loses its abilities. If you aren't the monarch, you become the monarch."

Defender