Demon Conquering Dragon, Dungaree "Unlimited"

(This ability is active if you have four or more damage):[ 2 & Bind one card face up from the top of your deck]When this unit attacks a vanguard, you may pay the cost. If you do, choose up to one of your opponent's rear-guards in the front row, retire it, and during your turn, this unit gets +2000 for each Narukami in your bind zone. :If you have a card named "Sealed Demon Dragon, Dungaree" in your soul, this unit gets +2000. /:Lord (If you have a unit without a same clan as this unit, this unit cannot attack)