Cosmic Hero, Grandsub (G-EB01/012EN) [Cosmic Roar]

[AUTO](RC)[1/Turn] Generation Break 1 (This ability is active if you have one or more face up G units in total on your (VC) or G zone):When this unit's [Power] is increased due to an effect from one of your cards, if this unit's [Power] is 13000 or greater, choose one of your vanguards, until end of turn, it gets [Power]+4000 and "[AUTO](VC):When this unit's attack hits a vanguard, your opponent chooses one of his or her rear-guards, and retires it.". (It does not activate from increases due to boosting and guarding)