Avacyn's Collar
Artifact — Equipment
Equipped creature gets +1/+0 and has [[ keyword: "vigilance" ]].
Whenever equipped creature dies, if it was a Human, create a 1/1 white Spirit creature token with [[ keyword: "flying" ]].
Equip 
James Paick
Rulings
The triggered ability checks whether the equipped creature as it last existed on the battlefield was a Human. (It doesn’t matter what its creature types are in the graveyard.)
(wotc • 2011-01-22)
Rulings
The triggered ability checks whether the equipped creature as it last existed on the battlefield was a Human. (It doesn’t matter what its creature types are in the graveyard.)
(wotc • 2011-01-22)