The Eternal Sleuth

The Eternal Sleuth may be cast at any time that
you could cast an instant. When The Eternal Sleuth
deals damage to a creature, destroy that creature.
When The Eternal Sleuth enters the battlefield, sacrifice it unless it escaped.
Whenever The Eternal Sleuth enters the battlefield or attacks, investigate. Then gain 1 life
equal to the number of clue tokens you control.
Escape--{u}{u/b}{b}, Exile three other cards from your graveyard.
"I will find you, and I will eat you." - The Eternal Sleuth