Assuming each of your three opponents has a creature to sacrifice, thats enough for Sephiroth to flip
Its not as powerful as a threat on its own, but most of the combo potential is still there
Even if your card isnt fake, a buyer may claim that its fake
Planes usually have two important parts: A main ability which can be a continuous effect, such as Tazeem in Zendikar (whose ability is that creatures can't block while this plane is active), or a triggered ability, such as Undercity Reaches from Ravnica (which allows the controller to draw a card each time one of their creatures deals combat damage to a player)
Equip abilities being used at instant speed and paying zero for the first equip ability are both awesome, but being able to bring back an Equipment from the graveyard and put it onto the battlefield when it enters the battlefield is really what pushes it over the top
8 Platinum Angel Not As Unbreakable As It Seems No Magic player's career is complete until they've encountered an unbeatable Platinum Angel