Cassian Briar, Death Defiant

Menace, Vigilance

At the start of each of your turns, silently choose a creature owned by each opponent. This creature becomes Cassian Briar's marked target until the start of your next turn. If Cassian Briar fights that creature in combat, he gains a +5/+5 until the start of your next turn. If the marked creature dies, you gain 3 life.