Glad you like it!
Your comments all seem pretty accurate. I normally play multiplayer, so if I decided to upgrade the deck, I would definitely include Kagemaro (who also works quite well with Blood Speaker), Damnation, Decree of Pain, Nevinyrral's Disk and Oblivion Stone right away.
Next in would be card advantage engines. Draw is great, like you said. I find myself tutoring for Phyrexian Etchings in most of my games. Therefore, Mind's Eye, Phyrexian Arena and Necropotence would be thrown in next.
I'm not sure whether or not I'd go with the big dudes plan. They hit hard, and you definitely have the mana to play them, but going in that direction would fundamentally change the nature of the deck (it might be better after all, though). Right now, the deck is focussed on recurring smaller utility guys over and over, and I like that. Since Maga doesn't usually need help from another creature, I'd probably leave that part of the deck the way it is.
Other cards I might throw in: Sol Ring, Demonic Tutor, Urborg Tomb, Volrath's Stronghold, Liliana Vess, Oversold Cemetery, Profane Command, and a smattering of bomby creatures to replace jank like Helldozer and Grotesque Hybrid
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