Ghoul Dragon, Gast Dragon

:Hollow (When this unit is placed on , you may have it become hollowed. If you do, retire it at the end of turn) :[Put two cards from the top of your deck into the drop zone] When this unit attacks a vanguard, you may pay the cost. If you do, this unit gets +3000 until end of that battle. Then, if this unit is hollowed, this unit gets +5000 until end of that battle. Drop zone:[ 1 & Choose one of your grade 2 or greater rear-guards, and retire it] Call this card to .