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Aside from there being some solid options for Bird cards in Bant, like Derevi, Empyrial Tactician, there are also cards like Murmuring Mystic and Flurry of Wings that can create Bird tokens for you
You don't have to reveal the cards in the face-down pile, no matter which zone they're put into
Dream Devourer: Is this broken
In the later parts of games, when you have enough lands or if you are just flooding, these become spells you can cast and are not just dead in your hand
What you can and can't do depends on what your opponent is doing