This signals that Standard is currently defined by the most efficient one-mana creatures and interactive spells, where the game begins in earnest on turn one, and falling behind is not an option
Battle-Axe gets out of control quickly, while Flail is used primarily in decks that want to combo, but is still good in decks that just want to attack uninterrupted
Palace Jailer The monarch mechanic makes Palace Jailer much better than the typical Banisher Priest variant
Crystal, Inhuman Princess The color identity for Crystal, Inhuman Princess unfortunately means its playability is restricted, though it's quite good in the decks that support it
Kess, Dissident Mage is essentially a better version of him (you can't cast instants on opponents' turns), but cheaper and has access to Red
Historically, unfair decks abused mana better than fair decks whether that be Storm, Amulet Titan or Krark-Clan Ironworks