Maybe a stupid thought, but it seems to me that if transformed cards (Delver in particular) are independent from their flipside, and an Engineered Explosives set at 0 takes care of one on the battlefield, along with not specifically stating on the card that it is in fact a blue card, please explain to me why a REB can send one packing. I looked up rulings, but so far I'm having no luck finding answers for myself. Thanks in advance.

-ABC