Seid, Lord of the Obscene

When Seid enters the battlefield, all opponents
lose 5 life. You gain life equal to the amount of
life lost this way.
{3}{b}{t}: Target creature an opponent controls
gains the devil subtype. The opponent may sacrifice a creature they control. If they do not,
you gain control of the target creature.
"I think champions are my favorite. They make such
fun toys once they've been corrupted...it's quite
nostalgic."