Rumbling Dragon, Briorves D-BT13/002 RRR

[AUTO]:When this unit is placed on (RC) or put on (GC), choose up to one grade 4 card from your hand, and reveal it. If you revealed a card, or your vanguard is grade 4, perform one of the following according to the circle this unit is on. ?(RC) ] Choose one of your opponent's rear-guards, retire it, and this unit gets [Power]+5000 until end of turn. ?(GC) ] This unit gets [Shield]+15000 until end of that battle. [AUTO]:When this card is discarded from hand while riding a grade 3 from the ride deck or paying the cost for Stride, draw a card.