If this Cranial Ram doesn't get banned immediately, it'll probably be because Grixis Affinity is a fairly unpopular deck in the Pauper meta right now
Today, youd expect a blue spell to bounce lands rather than commit mass destruction
For a long time now, black decks have basically been slave to Gray Merchant or Whip of Erebos in terms of lifegain
Brawl Not Legal Vintage Legal Timeless Not Legal Commander Legal Pauper Not Legal Oathbreaker Legal Penny Not Legal Toolbox Notes and Rules Information for Vincent, Vengeful Atoner: The damage dealt by Vincent as a result of its last ability is not combat damage and therefore doesn't cause the ability to trigger again
Reflector Mage played a key role in decks featuring Rally the Ancestors, and then later Bant Company, such that by the time that Azorius Flash was dominating the format people were very fed up with the card
That wont rule out this card as one of the better and more versatile blue creatures, and it's always an option as better, cheaper spells continue to be printed
