Screaming Nemesis is too strong a card, negating the entire green and part of white life gain cards in one card.
Red mono clearly has the wrong card power.

Too fast and one-sided. Too many people are red mono and diversity is dead. Game experience is terrible. Standard format is for a few biased people and the balance is dead.

You have to stack removal from one or two mana like in the lower environments because of these ridiculous card powers, and most green cards that can't do that are dead.