A twin-headed dragon will not be satisfied with just one prey.
[AUTO](VC/RC):When placed, COST [Counter Blast (1) & Soul Blast (1)], choose one of your opponent's rear-guards, retire it, and if this unit is on your (VC), draw a card.
[AUTO](RC):When it attacks a vanguard, if you have more rear-guards than your opponent, this unit gets [Power]+3000 until end of that battle.