Unless you somehow turn Boggart Mischief into a creature, that ability won't trigger when Boggart Mischief itself hits the graveyard
If the enchanted creature is no longer on the battlefield when Penumbra Umbra's second ability resolves, use its copiable values as it last existed on the battlefield
It's easy enough to reliably draw two cards on your own turn, even in Mono Red, with stuff like Faithless Looting, Cathartic Reunion, Mask of Memory, etc
When Kitnap enters, tap enchanted creature
That's why you owe Bucky a big thank you
Its a bit of a spicy pull, and it might be too risky for some Commander players, but it spiked as high at $25 about a year ago before dropping back off toward $10 and it might be due for another bump