Eradicator, Vowing Sword Dragon (SP)

[AUTO] Limit Break 4 (This ability is active if you have four or more damage):When a«Narukami» rides this unit, choose one of your opponent's rear-guards in the front row, retire it, and choose your vanguard, and that unit gets [Power]+10000 until end of turn.
[AUTO](VC):When this unit attacks, if the number of cards in your opponent's damage zone is three or more, this unit gets [Power]+2000 until end of that battle.
[CONT](VC/RC): Lord (If you have a unit without a same clan as this unit, this unit cannot attack)