A really good card to include in a lot of control decks. And it's neutral. The only thing that worries me is the consistency - it will really depend on how many 5+ mana spells you have included in your deck.
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“If you have an apple and I have an apple and we exchange these apples then you and I will still each have one apple. But if you have an idea and I have an idea and we exchange these ideas, then each of us will have two ideas.” ― George Bernard Shaw
If the condition can be fulfilled in your deck without making your deck worse, this is probably an auto include. Keeping in mind that it can hit face, it's just a really good effect that's useful in pretty much any situation.
Very good card. Reminds me of Blackwing Corruptor which did see a healthy amount of play back in the day. Any sort of Control Mage will be able to activate this. I would imagine Control Warriors will be eye balling this as well.