Upstream Dragon (G-BT04/018EN) [Soul Strike Against the Supreme]

[AUTO](RC) Generation Break 1 (This ability is active if you have one or more face up G units in total on your (VC) or G zone) :When this unit attacks a vanguard, you may have this unit get [Power]+4000 until end of that battle. If you do, at the end of that battle, return this unit to your deck, search your deck for up one grade 1 card, call it to (RC) as [Rest]. and shuffle your deck.