Halenvar, Valarjar Champion

Defender 3 (Whenever this creature is assigned as a blocker, this creature gain +0/+3 until the end of turn.)
Whenever Halenvar, Valarjar Champion is
assigned to block a creature, Halenvar, Valarjar Champion gains first strike.
{x}{r}{r}: Creatures you control gain +0/+X where
X is Halenvar, Valarjar Champion's toughness.