Well, both owls are for flying/unblockability for ninjutsu. The Owl familiar lets me draw a card when it enters play, which is nice because I will be returning it to my hand often with ninjutsu.
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Thanks for the comment Will. I'll add a couple ornithopters in place of my dimir infiltrator/owl familiar. I mainly play with a large group of friends, though, so I don't need the deck to be too quick.
Great deck Will...try adding an Ink-eyes if you can. How well does it play with relatively few flying/unblockable creatures?