I expect this card to be a massive hit in cEDH and casual alike
Blue is a color that embodies knowledge, and drawing cards is equivalent to having more knowledge at your disposal
The problem with Battle of Wits is that when you consider you will need 200 cards in your deck once it hits the battlefield and that it might take several (or many) turns to get Battle of Wits on the battlefield, you will need to play somewhere around 240 cards to make Battle of Wits work, which means you're increasing your deck size by 300%, which in turn leads to a massive drop in consistency, to the point where Battle of Wits simply isn't worth the cost in competitive decks
One attack can accelerate your mana, deal damage, and steal value from the opponents deck all at once
At worst, it can ramp you into bigger threats like Cavern-Hoard Dragon, Ancient Copper Dragon, or even Marut