Griffith, Falcon of Light

Flash, First Strike
Other humans you control gain +1/+1.
{b}{b}, Sacrifice three other human creatures:
Give the Branded emblem to an opponent who
doesn't already have one. Activate this ability
only any time you could cast a sorcery.
If an opponent has the Branded emblem at the
beginning of your upkeep, transform Griffith,
Falcon of Light.