Supreme Army Eradicator, Zuitan

:When your opponent's rear-guard is bound during your turn, this unit and all of your "Eradicator, Gauntlet Buster Dragon" on and get +5000 until end of turn. :At the end of the battle it attacked a vanguard, if your opponent's front row has no rear-guards, [put this unit into your soul], and draw a card.