I don't think you really need to reduce the size, but I do see a problem: with 70 cards you should have more than 4 creatures if you need them to win (at least I think you need). You won't be able to draw Kiln Fiend all the time and, even if you can draw one, if your opponent gets rid of it you won't have another. I would replace the 4 Call to Mind (because you already have a good number of spells) with 4 creatures or spells that interact with the number of spells you have already played... Maybe Criptoplasm would be a nice addition (you could copy one enemy creature or your Kiln Fiend).
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OK, just did it...
what would you change to make it 4?