Soul of Cinder

{3}{r} Reveal the top card of your library.
If it's an equipment, attach it to Soul of Cinder.
Otherwise, put the revealed card to your hand.
{t} If Soul of Cinder has 3 or more Equipments
attached to him, exile those Equipments
and Soul of Cinder. Then return him to the
battlefield transformed under his owners control.
Activate only as a sorcery.