Cooper Howard, Vault Boy

At the beginning of your upkeep, investigate.
When you sacrifice a Clue, Cooper Howard, Vault
Boy can't be blocked this turn.
War, War Never Changes - {t}, {p/b}{p/b}{p/b}: Exile
Cooper Howard, Vault Boy and return it to the battlefield under your control transformed.
—
"Us cowpokes, we take what we can get."