Bell-ringing Miko, Ouka (G-CHB02/028EN) [We ARE!!! Trinity Dragon]

[ACT](RC) Generation Break 1 Oracle (This abiility is active when you have five or more cards in your hand):[Retire this unit] If you have a vanguard with the oracle ability, choose one of your rear-guards, and until end of turn, it gets "[AUTO](RC):When this unit attacks, until end of that battle, your opponent cannot call grade 0 cards from hand to (GC).".