They never know if you have bloodrush when you send it into a bigger guy, and a lot of the red decks really like having a little guy to get the beats going
None of this feels overwhelming powerful at first, but once you follow up with a Cogworker's Puzzleknot, Servo Schematic, or Prophetic Prism you start to see the value to be gained
5 Brain Freeze Think Warm Thoughts Milling is one of the stranger ways to win a game, and with the storm card Brain Freeze, along with a healthy amount of spells cast before it, you can mill out your opponents very quickly
A further explanation for not banning the troublesome duo from the Lord of the Rings MTG set is that "Not many games are quickly decided by a runaway from either The One Ring or Orcish Bowmasters, allowing players to play longer interactive games with plenty of back-and-forth." As for the unbannings, Preordain, a card banned since 2011, is back in Modern, and Mind's Desire, which was swiftly banned in 2003, is back in Legacy
It also comes with a unique deckbuilding challenge because it requires a careful balance of human and non-human creatures to ensure you have the right ratios of sacrifice fodder and outlets
To get the obvious out of the way: yes, Guardian Sunmare is a clear homage to MTG favorite Sun Titan