R/B Anti-Enchantment options are small, that is sure, but between Mad Auntie and Wort, Boggart Auntie, the only thing you need fear is most (which could be a serious problem).

I am not sure how you could reliably bypass that, actually. SB Tombstalker could work, or possibly some SB flying Goblins. Wort can keep brining them back and Mad makes them pretty big, so winning isn't a problem. You could also SB SGC and bring it in against decks that run these powerful anti-attack measures.