Eradicator, Twin Thunder Dragon

(This ability is active if you have four or more damage):[ 2 & Choose three cards with "Eradicator" in its card name from your hand, and discard them] Retire all rear-guards of all fighters, if the number of cards retired by this effect is three or more, this unit gets +2 until end of turn.:During your main phase, when your opponent's rear-guard is put into the drop zone, this unit gets +3000 until end of turn.