Flying is a great one and for equipment decks, there are very few reasons you would not want this cheap mana resource

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It can end games quickly when paired with board wipes
(Melds with Hanweir Battlements.) Creature - Human Soldier Color tag templates(None) Headless Rider Whenever this creature or another nontoken Zombie you control dies, create a 2/2 black Zombie creature token
The ingenuity of lesson/learn is that almost every lesson becomes playable when you dont have to put it in your mainboard