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Based on my observations, the spider imp is at least an annoying nuisance even in the later stages. Although I removed it from my aggro deck.
Usually, enemies die immediately after I play Flame-Glass and cast Dishift, but this one apparently decided to see what would happen. Well, what happened... I had a second Dishift.
However, I found another drawback of Flame-n-Glass – it has twice as few slots for spells or other useful things compared to Flameweaver. I think Dragonbond Mage is a good and unconventional finisher, but I only have one right now, and I need to boost its spell power so that it summons dragons when needed, and not just one and a half per round. But if I happen to find a couple more, I'll use it instead of Flame-n-Glass.