Frong, All-Seeing Hell-Warden

Haste, vigilance, defender.
Frong, All-Seeing Hell-Warden can block up to three attacking creatures.
When Frong, All-Seeing Hell-Warden enters the battlefield under your control, exile target creature opponent controls. When Frong, All-Seeing Hell-Warden leaves the battlefield under your control, return that creature to the battlefield under that player's control.
No one escapes the underworld when he's around. He sees everything until he dies, and then some.