Casseopeia, Natural Planet Queen (WXDi-P02-036) [Changing Diva]

[Auto]: Whenever this SIGNI attacks, reveal the top four cards of your deck. If there are three or more level one SIGNI among them, until the end of your opponent's next end phase, this SIGNI gets +3000 power and gains [Shadow - SIGNI]. Put the revealed cards on the bottom of your deck in any order.
[Auto]: At the beginning of your main phase, you may pay (W)(C). If you do, return target SIGNI on your opponent's field to its owner's hand.