This means that other players don't know what the card is and you can't look at the card once it's imprinted (until it's turned face up, of course)
It was just such a natural progression, he says
it feels like every new 1-mana red rare with haste is compared to it
You see, these two keywords have never been used in any card neither prior nor after they printed Steamflogger Boss
There are Shop Tokens, there are Hourglass, there are Tickets and there are Emblems - it's all there, but as far as I can tell, you can only buy one of these, and while it's technically possible, it's not exactly front and centre in the interface
While no slouch in combat herself as a 5/4 creature, her ability triggers at the beginning of the combat step, rewarding you for each Human that's flocked to her banner