Every creature chips away at opponents life totals, which makes wide board states lethal without ever needing to attack and forces tables to answer it quickly or lose
When Unburial Rites rotates out of standard, gamers will look to this to fill in the blank - unfortunately, it doesn't look like it will quite fill the void
Two mana is dirt cheap for potentially not dying to a combo or a creature that would be otherwise too big for you to handle
If combat damage dealt to the monarch causes that player to lose the game, the triggered ability that causes the controller of the attacking creature to become the monarch doesn't resolve
3 and Garland, Knight of Cornelia Black Mage Aggro is WotCs title for this one, but Id classify this as more of a bleeder archetype if anything
Both of these enchantments shut down an entire metagame of card drawing