Death, Covenant Bringer

Haste, Deathtouch, Lifelink, Flying
—When Death, Covenant Bringer enters the battlefield, you may search your Library for a
card named 'Covenant with Death' and put it
into your hand. You may pay half your life
rounded up to play that card from your hand
this turn without paying its other costs.
—"He came from an open sky heralding a message
a promise to end the war and all the suffering it has brought, if only in return we offered ourselves."