Crystal Stag is an interesting idea, but unfortunately it's not a great value when returned to the field by Witching Hour. You don't get the battlecry and a 4/4 rush for 3 mana when what you really need is a big taunt or threat is disappointing. Even if you double it's health first with Predatory Instincts and drop two 4/8 rush cards, you had to have first restored 5 health (not just cast a heal 5 spell) and played a somewhat dead card in Predatory Instincts that cost 4. It just requires too many cards, in sequence, muddies the rez pool and slows your win condition. If the stags rezzed back as a 4/8 it might be an include, but they aren't.
Crystal Stag is an interesting idea, but unfortunately it's not a great value when returned to the field by Witching Hour. You don't get the battlecry and a 4/4 rush for 3 mana when what you really need is a big taunt or threat is disappointing. Even if you double it's health first with Predatory Instincts and drop two 4/8 rush cards, you had to have first restored 5 health (not just cast a heal 5 spell) and played a somewhat dead card in Predatory Instincts that cost 4. It just requires too many cards, in sequence, muddies the rez pool and slows your win condition. If the stags rezzed back as a 4/8 it might be an include, but they aren't.