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after trying it in my BF deck for a few tournaments i feel that bora the black spear is much better and it is not so useful in a BF deck as in a bf deck there is not much cards u want to return to your hand unless it is a kalut or bora or gale,plus it is not a trigger effect
the good points of this card is that if u have a face up kalut on the field that u want to return to hand and u have a black whirlwind and u have more than 400 life points u can use its effect to send kalut back to hand and summon it again to search wif whirlwind
the bad point if u have less than 400 life points and u need zephyros it can not be summon and if u do not have a tuner or icarus the card will become very useless as its attack is only 1600
well in overall i think that zephyros is best played in decks like grave bf or dandy warrior or quick draw dand or any deck that sends monster to the grave very fast