Astrea's Armor of Threa

Flying, Trample
{1}{g}{g} Engrave -Attach this creature to a creature.
As long as this is Engraved on a creature it's not a creature, it's an equipment.
Engraved creature gets +6/+6 and has Flying and Trample
If Astrea's Armor of Threa isn't a creature
creatures you control have reach