Mark for Death

Target creature an opponent controls blocks this
turn if able. Untap that creature. Other creatures
that player controls can't block this turn.
"And, England, if my love thou hold'st at aught--
Pays homage to us--thou mayst not coldly set
Our sovereign process; which imports at full,
By letters congruing to that effect,
The present death of Hamlet."
—King Claudius. Act IV, Scene III