Kelsey, God of Legions

Creatures you control have reach
Whenever Kelsey, God of Legions attacks, it +1/+1 for each attacking creature you control until the end of turn.
{t}: Kelsey becomes a legendary enchantment artifact that has: Equipped{0} and (Equipped creature gets +1/+1 for each creature you control. Creatures you control get +1/+1 for each attacking creature you control until the end of turn)