Jarvan IV,Exemplar of Demacia

When Jarvan IV, Exemplar of Demacia attacks,
you may target a creature the opponent controls,
it must block Jarvan IV, Exemplar of Demacia
and no other creatures can block this card.
Whenever this creature is blocked, it gains +2/+2
until the end of the turn and you may put two
+1/+1 counters on creatures you control.
When a Demacian creature you control dies, proliferate.